WO2009096509A1 - Node device, communication system, and service providing method - Google Patents

Node device, communication system, and service providing method Download PDF

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Publication number
WO2009096509A1
WO2009096509A1 PCT/JP2009/051544 JP2009051544W WO2009096509A1 WO 2009096509 A1 WO2009096509 A1 WO 2009096509A1 JP 2009051544 W JP2009051544 W JP 2009051544W WO 2009096509 A1 WO2009096509 A1 WO 2009096509A1
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WO
WIPO (PCT)
Prior art keywords
cscf
node device
sip
health check
node
Prior art date
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PCT/JP2009/051544
Other languages
French (fr)
Japanese (ja)
Inventor
Tamaki Ishii
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Nec Corporation
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Publication date
Application filed by Nec Corporation filed Critical Nec Corporation
Priority to US12/747,958 priority Critical patent/US20100287406A1/en
Priority to KR1020107016555A priority patent/KR101107801B1/en
Priority to EP09705517.2A priority patent/EP2239893A4/en
Priority to CN2009801029409A priority patent/CN101926136A/en
Publication of WO2009096509A1 publication Critical patent/WO2009096509A1/en

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L65/00—Network arrangements, protocols or services for supporting real-time applications in data packet communication
    • H04L65/10—Architectures or entities
    • H04L65/1016—IP multimedia subsystem [IMS]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L43/00—Arrangements for monitoring or testing data switching networks
    • H04L43/08—Monitoring or testing based on specific metrics, e.g. QoS, energy consumption or environmental parameters
    • H04L43/0805—Monitoring or testing based on specific metrics, e.g. QoS, energy consumption or environmental parameters by checking availability
    • H04L43/0817—Monitoring or testing based on specific metrics, e.g. QoS, energy consumption or environmental parameters by checking availability by checking functioning
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L43/00—Arrangements for monitoring or testing data switching networks
    • H04L43/10—Active monitoring, e.g. heartbeat, ping or trace-route
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L45/00—Routing or path finding of packets in data switching networks
    • H04L45/22—Alternate routing
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L65/00—Network arrangements, protocols or services for supporting real-time applications in data packet communication
    • H04L65/1066—Session management
    • H04L65/1101—Session protocols
    • H04L65/1104—Session initiation protocol [SIP]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L65/00—Network arrangements, protocols or services for supporting real-time applications in data packet communication
    • H04L65/80—Responding to QoS
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L69/00—Network arrangements, protocols or services independent of the application payload and not provided for in the other groups of this subclass
    • H04L69/40—Network arrangements, protocols or services independent of the application payload and not provided for in the other groups of this subclass for recovering from a failure of a protocol instance or entity, e.g. service redundancy protocols, protocol state redundancy or protocol service redirection
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M3/00—Automatic or semi-automatic exchanges
    • H04M3/42—Systems providing special services or facilities to subscribers
    • H04M3/42017—Customized ring-back tones
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W40/00—Communication routing or communication path finding
    • H04W40/02—Communication route or path selection, e.g. power-based or shortest path routing

Definitions

  • the present invention relates to a node device, a communication system, and a service providing method in an IMS (IP (Internet Protocol) Multimedia Subsystem) network that uses SIP (Session Initiation Protocol) to control multimedia communication including voice.
  • IMS Internet Protocol
  • SIP Session Initiation Protocol
  • FIG. 1 shows registration control in an IMS network related to the present invention.
  • a P-CSCF (Proxy-Call Session Control Function) 31 shown in FIG. 1 is a SIP server that the SIP terminal 35 contacts first.
  • An AS (Application Server) 33 is a server that processes additional services.
  • An S-CSCF (Serving-Call Session Control Function) 32 is a SIP server that mainly performs service execution and session control, and communicates with the AS 33 when additional services are executed.
  • An HSS (Home Subscriber Server) 34 is a server that manages subscriber information.
  • the SIP terminal 35 transmits a registration request by the SIP REGISTER signal to the P-CSCF 31 (step 401).
  • the P-CSCF 31 When the P-CSCF 31 receives a registration request by the SIP REGISTER signal from the SIP terminal 35, the P-CSCF 31 obtains information on the S-CSCF of the REGISTER transmission destination from the HSS 34. A procedure is performed (step 402).
  • the P-CSCF 31 selects the S-CSCF 32 from the S-CSCF information acquired from the HSS 34, and transmits the SIP REGISTER signal to the selected S-CSCF 32 (step 403).
  • the S-CSCF 32 that has received the SIP REGISTER signal performs a DIAMETER SAR (Server Assignment Request) / SAA (Server Assignment Answer) procedure in order to acquire the subscriber data of the user and the AS information of the REGISTER destination (step 404). .
  • DIAMETER SAR Server Assignment Request
  • SAA Server Assignment Answer
  • the S-CSCF 32 stores the subscriber data acquired from the HSS 34, selects the AS 33 from the AS information acquired from the HSS 34, and transmits the SIP REGISTER signal to the selected AS 33 (step 405).
  • the AS 33 that has received the SIP REGISTER signal performs a DIAMETER UDR (User Data Request) / UDA (User Data Answer) procedure in order to acquire user service subscriber data (Step 406).
  • DIAMETER UDR User Data Request
  • UDA User Data Answer
  • the S-CSCF and AS that provide the IMS service to the user are determined by the registration procedures 401 to 406 described above.
  • FIG. 2 shows outgoing / incoming control when the S-CSCF fails in the IMS network related to the present invention.
  • the S-CSCF 32a is in a failure state due to some factor (step 501).
  • the SIP terminal 35 transmits a call request based on the SIP INVITE signal to the P-CSCF 31 via the access network 300 in the failure state of the S-CSCF 32a (step 502)
  • the P-CSCF 31 is the S-S determined at the time of registration.
  • a SIP INVITE signal is transmitted to the CSCF 32a (step 503).
  • the S-CSCF 32a Since the S-CSCF 32a is in a failure state, the S-CSCF 32a cannot receive the SIP INVITE signal and does not return a response to the P-CSCF 31, so the P-CSCF 31 detects a response waiting timeout for the SIP INVITE signal. (Step 504).
  • the P-CSCF 31 that has detected the timeout sends an error indicating that the call request has not been accepted to the SIP terminal 35 via the access network 300 (step 505).
  • the S-CSCF 32b transmits a SIP INVITE signal to the S-CSCF 32a in order to make an incoming call request (step 506). Since the S-CSCF 32a is in a failure state, it cannot receive the SIP INVITE signal and does not return a response to the S-CSCF 32b. Therefore, the S-CSCF 32b detects a response waiting timeout for the SIP INVITE signal (step 507). .
  • Patent Document 1 A method and apparatus for providing a multimedia ringback service to a user device in an IMS network is disclosed in Japanese Patent Application Laid-Open No. 2006-191594 (hereinafter referred to as Patent Document 1).
  • a connection establishment request from a calling party device serves to establish a connection between a calling party device and a called party device in an IMS network, and a connection establishment request is made.
  • the multimedia content to the calling party device Send at least some of the information.
  • the S-CSCF and AS that perform the outgoing / incoming service of the corresponding user at the time of registration are selected. Therefore, if the IMS node selected at the time of registration becomes a node failure due to some cause, the re-assignment to another IMS node is not performed by the deregistration from the user until the failed node is recovered. However, there is a problem that services such as outgoing and incoming calls cannot be provided.
  • the outgoing / incoming service cannot be provided. Furthermore, in the IMS network related to the present invention, there is a problem similar to the above in providing services such as outgoing / incoming calls in regard to outgoing / incoming control at the time of AS failure.
  • Patent Document 1 only describes providing a multimedia ringback service to a user device, and there is no problem regarding the above-described registration failure or AS failure. Since it is not described, the above problem cannot be solved.
  • An example of an object of the present invention is to provide a node device, a communication system, and a service providing method that can recognize a node failure of an adjacent node and allow a user to continuously enjoy outgoing and incoming IMS services. is there.
  • a node device is a node device of an IP multimedia subsystem that provides a multimedia service to a user using SIP for control of multimedia communication including voice, and for a neighboring node device.
  • a health check unit that performs a health check and a recognition unit that recognizes a failure state of an adjacent node device based on a result of the health check by the health check unit.
  • a communication system has a configuration including a plurality of node devices according to one aspect of the present invention.
  • a service providing method is a service providing method by a node device of an IP multimedia subsystem that provides a multimedia service to a user using SIP for controlling multimedia communication including voice.
  • a health check process for performing a health check on the node device to be recognized, and a recognition process for recognizing a failure state of an adjacent node device based on a result of the health check by the health check process.
  • FIG. 1 is a diagram showing registration control in an IMS network related to the present invention.
  • FIG. 2 is a diagram showing outgoing / incoming control when the S-CSCF fails in the IMS network related to the present invention.
  • FIG. 3 is a block diagram showing a configuration example of an IMS network according to the present invention.
  • FIG. 4 is a diagram showing a SIP OPTIONS health check procedure for adjacent nodes in the IMS network according to the first embodiment of the present invention.
  • FIG. 5 is a diagram showing a call detour control procedure by an adjacent node when the S-CSCF fails in the first embodiment of the present invention.
  • FIG. 6 is a diagram showing an incoming call detour control procedure by an adjacent node when the S-CSCF fails in the first embodiment of this invention.
  • FIG. 7 is a block diagram showing a configuration example of an IMS network in the second exemplary embodiment of the present invention.
  • FIG. 8 is a diagram showing an IMS registration procedure in the second embodiment of the present invention.
  • FIG. 9 is a diagram showing a call detour control procedure when the S-CSCF fails in the second embodiment of the present invention.
  • FIG. 10 is a diagram showing an incoming call detour control procedure when the S-CSCF fails in the second embodiment of the present invention.
  • FIG. 11 is a diagram showing an outgoing call detouring procedure at the time of an AS failure in the third embodiment of the present invention.
  • FIG. 12 is a diagram showing an incoming call detouring procedure at the time of AS failure in the third embodiment of the present invention.
  • FIG. 3 is a block diagram showing a configuration example of an IMS network according to the present invention.
  • the IMS network according to the present invention has a configuration having a P-CSCF 1, an S-CSCF 2a, and an S-CSCF 2b.
  • the P-CSCF 1 is a health check unit 11 that performs a health check using the SIP OPTIONS method between IMS nodes (between the P-CSCF 1 and the S-CSCF 2 a), and the opposing IMS based on the check result of the health check unit 11. And an opposite node failure recognition unit 12 that detects a failure of the node (S-CSCF2a).
  • the S-CSCF 2b is based on the health check unit 21b that performs a health check using the SIP OPTIONS method between IMS nodes (between the S-CSCF 2b and the S-CSCF 2a), and the check result of the health check unit 21b. And an opposing node failure recognition unit 22b that detects a failure of the opposing IMS node (S-CSCF2a). Although not shown, the S-CSCF 2a has the same configuration as the S-CSCF 2b.
  • the P-CSCF 1 periodically transmits SIP OPTIONS for inquiring about the capability and status of the communication partner to the opposing S-CSCF 2 a.
  • SIP OPTIONS SIP 200 OK
  • the P-CSCF 1 can recognize that the node state of the opposing S-CSCF 2a is normal.
  • the P-CSCF 1 does not receive the health check response 200 OK (OPTIONS)
  • the P-CSCF 1 can recognize that the opposing S-CSCF 2 a is in a failure state.
  • the S-CSCF 2b periodically transmits the SIP OPTIONS to the opposing S-CSCF 2a.
  • SIP OPTIONS SIP 200 OK
  • the S-CSCF 2b can recognize that the node state of the opposing S-CSCF 2a is normal. Further, when the S-CSCF 2b does not receive the health check response 200 OK (OPTIONS), the S-CSCF 2b can recognize that the opposing S-CSCF 2a is in a failure state.
  • OTIONS health check response 200 OK
  • the adjacent node can recognize that the outgoing / incoming service cannot be provided at the time of the outgoing call request from the user and the incoming call request to the user.
  • FIG. 4 shows a SIP OPTIONS health check procedure for adjacent nodes in the IMS network according to the first embodiment of the present invention.
  • FIG. 5 shows an outgoing call detour control procedure by the adjacent node when the S-CSCF fails according to the first embodiment of the present invention.
  • FIG. 6 shows an incoming call detour control procedure by an adjacent node when the S-CSCF fails according to the first embodiment of the present invention.
  • the first embodiment of the present invention it is possible to recognize a failure state of an adjacent node by implementing a health check method based on SIP OPTIONS in an IMS network.
  • a health check method based on SIP OPTIONS in an IMS network.
  • FIG. 4 shows a health check procedure by SIP OPTIONS in the IMS network.
  • the IMS network according to the first embodiment of the present invention includes a P-CSCF 1, an S-CSCF 2a, an S-CSCF 2b, and an AS 3.
  • the P-CSCF 1 includes the health check unit 11 and the opposing node failure recognition unit 12, and a re-registration procedure execution unit that executes a re-registration procedure using the SIP MESSAGE method when the opposing node failure recognition unit 12 detects a node failure. 13.
  • the S-CSCF 2a and S-CSCF 2b perform re-registration by the SIP MESSAGE method when the health check units 21a and 21b, the opposing node failure recognition units 22a and 22b, and the opposing node failure recognition units 22a and 22b detect a node failure. And a re-registration procedure execution unit 23a, 23b for executing the procedure.
  • the P-CSCF 1 periodically sends SIP OPTIONS for inquiring about the capability and state of the communication partner to the opposing S-CSCF 2a by the health check unit 11 (step 101).
  • the S-CSCF 2a transmits SIP 200 OK (OPTIONS) indicating normal health check to the P-CSCF 1 (step 102). Note that SIP 200 OK (OPTIONS) is transmitted from the health check unit 21a to the P-CSCF1.
  • the opposing node failure recognition unit 12 of the P-CSCF 1 can recognize that the node state of the opposing S-CSCF 2a is normal. Further, the opposite node failure recognition unit 12 of the P-CSCF 1 can recognize that the opposite S-CSCF 2a is in a failure state when it does not receive 200 OK (OPTIONS) as a health check response.
  • OTIONS 200 OK
  • the S-CSCF 2a periodically transmits SIP OPTIONS to the opposing AS 3 by the health check unit 21a (step 103).
  • the AS 3 receives the health check request from the SIP OPTIONS, the AS 3 transmits SIP 200 OK (OPTIONS) indicating normal health check to the S-CSCF 2a (step 104).
  • SIP 200 OK OTIONS
  • the opposite node failure recognition unit 22a of the S-CSCF 2a can recognize that the node state of the opposite AS 3 is normal. Further, the opposite node failure recognition unit 22a of the S-CSCF 2a can recognize that the opposite AS 3 is in a failure state when the health check response 200 OK (OPTIONS) is not received.
  • OTIONS health check response 200 OK
  • the S-CSCF 2b periodically transmits SIP OPTIONS to the opposing S-CSCF 2a by the health check unit 21b (step 105).
  • the S-CSCF 2a Upon receiving the health check request by SIP OPTIONS, the S-CSCF 2a transmits SIP 200 OK (OPTIONS) indicating that the health check is normal to the S-CSCF 2b (step 106). Also in this case, SIP 200 OK (OPTIONS) is transmitted from the health check unit 21a to the S-CSCF 2b.
  • the opposing node failure recognition unit 22b of the S-CSCF 2b can recognize that the node state of the opposing S-CSCF 2a is normal. Further, the opposite node failure recognition unit 22b of the S-CSCF 2b can recognize that the opposite S-CSCF 2a is in a failure state when the health check response 200 OK (OPTIONS) is not received.
  • OTIONS health check response 200 OK
  • FIG. 5 shows an outgoing call detour control procedure when the S-CSCF enters a failure state due to some cause.
  • P-CSCF1, S-CSCF2a, and S-CSCF2b have the same configuration as that shown in FIG. Further, it is assumed that the S-CSCF 2a enters a failure state for some reason (step 201).
  • the P-CSCF 1 When the P-CSCF 1 starts the health check that is periodically performed, the P-CSCF 1 transmits a SIP OPTIONS signal to the S-CSCF 2a (step 202). Since the S-CSCF 2a is in a fault state, the SIP OPTIONS signal cannot be received and a health check response cannot be returned. For this reason, the P-CSCF 1 that has transmitted the SIP OPTIONS signal of the health check detects a response wait timeout and recognizes that the opposing S-CSCF 2a is in a failure state (step 203).
  • the SIP terminal 5 sends a SIP INVITE signal via the access network 100 to the P-CSCF 1 determined at the time of registration in order to make a call request (step 204).
  • the P-CSCF 1 that has received the SIP INVITE signal tries to transmit the SIP INVITE signal to the S-CSCF 2a selected at the time of registration in order to perform the outgoing call processing. However, since the S-CSCF 2a is in a failure state, the P-CSCF 1 A SIP MESSAGE signal (re-REG request) indicating a registration request is transmitted (step 205). Note that the SIP MESSAGE signal (re-REG request) is transmitted from the re-registration procedure execution unit 13 of the P-CSCF 1 shown in FIG.
  • the SIP terminal 5 that has received the SIP MESSAGE signal determines that it is a re-registration request, and sends a SIP REGISTER signal to the P-CSCF 1 that is the source of the SIP MESSAGE signal (step 206).
  • the P-CSCF 1 Upon receiving the SIP REGISTER signal, the P-CSCF 1 performs the DIAMETER UAR / UAA procedure to the HSS 4 in order to perform the re-registration procedure of the corresponding user (step 207).
  • the P-CSCF 1 selects an S-CSCF 2b other than the S-CSCF 2a in a failed state from the S-CSCF information acquired from the HSS 4 by the UAR / UAA procedure, and transmits a SIP REGISTER signal to the S-CSCF 2b (step 208). .
  • the S-CSCF 2b that has received the SIP REGISTER signal performs normal registration processing in cooperation with the HSS 4 and AS 3 (step 209).
  • the P-CSCF 1 transmits a SIP INVITE signal to the newly registered S-CSCF 2b and continues the calling process (step 210).
  • FIG. 6 shows an incoming call control procedure when the S-CSCF enters a failure state for some reason. In this case, it is assumed that the S-CSCF 2a has entered a failure state for some reason (step 301).
  • the S-CSCF 2b When the S-CSCF 2b starts the health check that is periodically performed, the S-CSCF 2b transmits a SIP OPTIONS signal to the S-CSCF 2a (step 302). Since the S-CSCF 2a is in a fault state, the SIP OPTIONS signal cannot be received and a health check response cannot be returned. For this reason, the S-CSCF 2b that has transmitted the SIP OPTIONS signal of the health check detects a response wait timeout and recognizes that the opposing S-CSCF 2a is in a failure state (step 303).
  • the S-CSCF 2b specifies the S-CSCF 2a in which the called party is accommodated by the HSS 4 and the DIAMETER LIR (Location Info Request) / LIA (Location Info Answer) procedure, and makes an incoming request to the S-CSCF 2a. An attempt is made to transmit a signal to the S-CSCF 2a.
  • the S-CSCF 2b selects another S-CSCF 2c opposite to the S-CSCF 2b and transmits a SIP INVITE signal to the S-CSCF 2c (step 304).
  • the S-CSCF 2c that has received the SIP INVITE signal transmits a DIAMETER SAR signal to the HSS 4 in order to perform the UNREGISTERED SERVICE procedure to the HSS 4 because there is no profile of the user who has received the incoming call request (step 305).
  • the HSS4 that has received the UNREGISTERD SERVICE request by the DIAMETER SAR recognizes that a diversion incoming call has occurred because the user is in the registration state, and information on the P-CSCF in which the user is registered, SIP
  • the contact address information of the terminal 5 is set in the DIAMETER SAA signal and transmitted to the S-CSCF 2c (step 306).
  • the HSS 4 receives the P-CSCF information and the contact address information of the SIP terminal 5 from the S-CSCF 2a via the DIAMETER SAA signal when registering from the user, and necessary for realizing this failure bypass procedure. Need to remember.
  • the S-CSCF 2c recognizes that re-registration is necessary based on the P-CSCF information set in the signal information and the contact address information of the SIP terminal 5, and re-registers with the acquired P-CSCF 1.
  • SIP MESSAGE (re-reg request) signal for requesting transmission is transmitted (step 307).
  • the P-CSCF 1 that has received the SIP MESSAGE signal transmits the SIP MESSAGE signal to the SIP terminal 5.
  • the SIP terminal 5 that has received the SIP MESSAGE signal determines that it is a re-registration request, and sends a SIP REGISTER signal to the P-CSCF 1 that is the transmission source of the SIP MESSAGE signal.
  • the P-CSCF 1 that has received the SIP REGISTER signal performs a normal registration procedure, and completes the re-registration process to the S-CSCF 2c (step 308). After the re-registration process is completed, the S-CSCF 2c transmits a SIP INVITE signal to the AS 3 selected at the time of registration in order to continue the incoming request (step 309).
  • the user can continue the incoming call service by performing the re-registration process.
  • the adjacent node detects the failure of the S-CSCF by the health check by SIP OPTIONS. Then, by performing the re-registration procedure (SIP MESSAGE signal transmission) by the adjacent node that has recognized the failure state, it is possible to provide the outgoing / incoming service from the user as before the S-CSCF failure. Therefore, in this embodiment, the above-described problems can be solved.
  • the adjacent node can recognize that the outgoing / incoming service cannot be provided at the time of the outgoing call request from the user and the incoming call request to the user.
  • a re-registration request by the SIP MESSAGE method is specified, and a node that recognizes a failure of the opposite node at the time of call origination / reception performs a re-registration process by the SIP MESSAGE method. It is possible to perform the registration procedure bypassing the IMS node. Furthermore, in the present embodiment, even when the S-CSCF becomes a failure, it is possible to continue providing IMS services such as outgoing / incoming calls.
  • FIG. 7 is a block diagram showing a configuration example of an IMS network according to the second exemplary embodiment of the present invention.
  • the IMS network according to the second embodiment of the present invention includes a P-CSCF 1, an S-CSCF 2, an AS 3, an HSS 4, and a SIP terminal 5.
  • the configurations of the P-CSCF 1 and the S-CSCF 2 are the same as those of the first embodiment of the present invention shown in FIG. 4 described above.
  • the SIP terminal 5 enjoys IMS services such as VoIP (Voice over IP) services from the IMS network by performing a registration procedure via Gm-I / F (interface) using the SIP protocol. .
  • IMS services such as VoIP (Voice over IP) services from the IMS network by performing a registration procedure via Gm-I / F (interface) using the SIP protocol. .
  • the P-CSCF1 Upon receiving the SIP REGISTER signal from the SIP terminal 5, the P-CSCF1 acquires information on the S-CSCF2 that provides the IMS service from the subscriber database HSS4 via the Cx-I / F using the DIAMETER protocol, and the SIP. A REGISTER signal is transmitted to the S-CSCF2. Further, when the registration procedure is completed, registration information such as the Contact IP address of the SIP terminal 5 and the IP address of the S-CSCF 2 is held, and the relay control of the SIP signal in the subsequent IMS service is performed.
  • the S-CSCF2 When the S-CSCF2 receives the SIP REGISTER signal from the P-CSCF1, it acquires the subscriber data from the HSS4 via the Cx-I / F using the DIAMETER protocol, and subscribes to subsequent outgoing / incoming services by holding this data. According to person data.
  • the S-CSCF 2 transmits a SIP REGISTER signal to the AS 3 according to iFC (initial Filter Criteria) information included in the subscriber data from the HSS 4.
  • iFC initial Filter Criteria
  • the S-CSCF 2 holds the registration information such as the IP address of the P-CSCF 1 to enable the routing of the P-CSCF 1 at the incoming service.
  • the AS 3 When the AS 3 receives the SIP REGISTER signal from the S-CSCF 2, it acquires the subscriber data from the HSS 4 via the Sh-I / F using the DIAMETER protocol, and holds this to hold the subsequent outgoing / incoming service to the subscriber.
  • the AS 3 When the AS 3 receives the SIP REGISTER signal from the S-CSCF 2, it acquires the subscriber data from the HSS 4 via the Sh-I / F using the DIAMETER protocol, and holds this to hold the subsequent outgoing / incoming service to the subscriber.
  • the AS 3 When the AS 3 receives the SIP REGISTER signal from the S-CSCF 2, it acquires the subscriber data from the HSS 4 via the Sh-I / F using the DIAMETER protocol, and holds this to hold the subsequent outgoing / incoming service to the subscriber.
  • the HSS 4 is a subscriber database that manages service data of all subscribers, and transmits subscriber data in accordance with requests from the S-CSCF 2 and AS 3. Further, the HSS 4 notifies the P-CSCF 1 of the S-CSCF 2 that performs registration control in the registration procedure, and holds the address of the S-CSCF 2 that has made the notification.
  • the present embodiment downloads subscriber data necessary for performing outgoing / incoming service in the S-CSCF2 or AS3 from the subscriber database HSS4 by the SIP REGISTER signal from the SIP terminal 5.
  • the service is applied to an IMS network that provides a service according to subscriber data.
  • FIG. 8 is a diagram showing an IMS registration procedure according to the second embodiment of the present invention.
  • FIG. 9 is a diagram showing an outgoing call detour control procedure when the S-CSCF fails according to the second embodiment of the present invention.
  • FIG. 10 is a diagram showing an incoming call detour control procedure when the S-CSCF fails according to the second embodiment of the present invention.
  • the SIP terminal transmits a SIP REGISTER signal to the P-CSCF in order to make a registration request (step a1).
  • the P-CSCF that has received the SIP REGISTER signal performs the DIAMETER UAR / UAA procedure to the HSS in order to select the S-CSCF that transmits the SIP REGISTER signal (step a2).
  • the P-CSCF selects the S-CSCF, and transmits a SIP REGISTER signal to the selected S-CSCF (step a3).
  • the S-CSCF acquires the IP address of the SIP terminal and the IP address of the P-CSCF from the Contact header and the Route header in the received SIP REGISTER signal, sets these information in the DIAMETER SAR signal, and transmits it to the HSS ( Step a4).
  • the HSS that has received the DIAMETER SAR signal stores the set IP address of the SIP terminal and the IP address of the P-CSCF, and transmits the subscriber's service profile to the S-CSCF using the DIAMETER SAA signal (step a5).
  • the S-CSCF that has received the DIAMETER SAA signal transmits SIP 200 OK indicating the completion of the registration procedure to the P-CSCF (step a6).
  • the P-CSCF that has received the SIP 200 OK transmits a SIP 200 OK indicating completion of the registration procedure to the SIP terminal (step a7).
  • the S-CSCF transmits a SIP REGISTER signal to perform registration with the AS (step a8).
  • the AS performs the DIAMETER UDR / UDA procedure to the HSS in order to acquire the subscriber's service profile (step a9), and transmits SIP 200 OK indicating completion of the registration procedure to the S-CSCF (step a10).
  • step b1 a description will be given of a call detour control procedure when an S-CSCF failure occurs according to the second embodiment of the present invention.
  • the S-CSCF 2a has a node failure due to some factor (step b1).
  • the P-CSCF starts a health check procedure that is periodically performed, and transmits a SIP OPTIONS signal to the S-CSCF 2a (step b2). Since the S-CSCF2a cannot receive the SIP OPTIONS signal because it is in a failure state, the P-CSCF detects a response waiting timeout for the SIP OPTIONS signal of the transmitted health check, and the S-CSCF2a is in the failure state This is recognized (step b3).
  • the SIP terminal transmits a SIP INVITE signal to the P-CSCF in order to make a call request (step b4).
  • the P-CSCF that has received the SIP INVITE signal tries to send the SIP INVITE signal to the S-CSCF 2a in order to perform outgoing call processing.
  • the S-CSCF 2a is in a failure state, it is determined that a re-registration procedure is necessary. (Step b5).
  • the P-CSCF sets the extension header “X-ServiceType: registration_request” to the SIP MESSAGE signal and transmits it to the SIP terminal for re-registration (step b6).
  • the SIP terminal that has received the SIP MESSAGE signal recognizes that re-registration is necessary, and transmits a SIP REGISTER signal to the P-CSCF (step b7). Since the S-CSCF 2a is faulty, a registration procedure for another S-CSCF 2b is performed (step b8).
  • the P-CSCF transmits a SIP 200 OK signal to the SIP terminal (step b9).
  • the SIP terminal that has received the SIP 200 OK signal transmits a response signal (SIP 200 OK signal) to the SIP MESSAGE signal to the P-CSCF because the registration is completed (step b10).
  • the P-CSCF recognizes that the re-registration process from the SIP terminal has succeeded, continues the call request process from the SIP terminal (step b11), and sends the SIP INVITE signal to the S-CSCF 2b. Is transmitted (step b12).
  • step c1 an incoming call detour control procedure when an S-CSCF failure occurs according to the second embodiment of the present invention.
  • the S-CSCF 2a has a node failure due to some factor (step c1).
  • the S-CSCF 2c starts a health check procedure that is periodically performed, and transmits a SIP OPTIONS signal to the S-CSCF 2a (step c2). Since S-CSCF2a is in a failure state and cannot receive the SIP OPTIONS signal, S-CSCF2c detects a response wait timeout for the SIP OPTIONS signal of the transmitted health check, and S-CSCF2a is in the failure state. Recognize that it exists (step c3).
  • the S-CSCF 2c When the S-CSCF 2c receives a call request to the SIP terminal by the SIP INVITE signal (step c4), the S-CSCF 2c performs the DIAMETER LIR / LIA procedure to the HSS to acquire the destination of the SIP INVITE signal (step c5). Is S-CSCF2a.
  • the S-CSCF 2c determines that the S-CSCF 2a that is the transmission destination of the SIP INVITE signal is in a failure state, the S-CSCF 2c selects the S-CSCF 2b and transmits the SIP INVITE signal (steps c6 and c7).
  • the S-CSCF 2b that has received the SIP INVITE signal does not hold the subscriber data that has received the incoming call request. Therefore, the UNREGISTERED SERVICE procedure is performed (step c8), and the DIAMETER SAR (UNREGISTERED SERVICE) signal is transmitted to the HSS ( Step c9).
  • the HSS that has received the DIAMETER SAR signal recognizes that a detour procedure at the time of failure has occurred because the user is in the registration state, and stores the SIP terminal and P-CSCF stored in the DIAMETER SAA signal at the time of registration. IP address information is set, and this DIAMETER SAA signal is transmitted to the S-CSCF 2b (step c10).
  • the S-CSCF 2b that has received the DIAMETER SAA signal recognizes that the incoming call detour processing due to the failure has occurred since the IP address information of the SIP terminal and the P-CSCF is set in the received signal, and the SIP MESSAGE.
  • An extension header “X-ServiceType: registration_request” is set in the signal, and the SIP MESSAGE signal is transmitted to the P-CSCF (step c11). Further, the P-CSCF transmits the received SIP MESSAGE signal to the SIP terminal (step c12).
  • the SIP terminal that has received the SIP MESSAGE signal recognizes that re-registration is necessary, and transmits a SIP REGISTER signal to the P-CSCF (step c13).
  • a registration procedure to another S-CSCF 2b is performed (step c14).
  • the P-CSCF transmits a SIP 200 OK signal to the SIP terminal (step c15).
  • the SIP terminal that has received the SIP 200 OK signal transmits a response signal (SIP 200 OK signal) to the SIP MESSAGE signal to the P-CSCF because registration is completed (step c16).
  • the P-CSCF that has received the response signal to the SIP MESSAGE signal transmits a SIP 200 OK signal to the S-CSCF 2b (step c17).
  • the S-CSCF 2b recognizes that the re-registration process from the SIP terminal has succeeded, and continues the incoming INVITE request received from the S-CSCF 2c (step c18).
  • a node in an IMS network can recognize a node failure of an adjacent node by periodically performing a health check method using the SIP OPTIONS method with the adjacent node.
  • the node that has determined the failure can perform the re-registration procedure.
  • the user can continue to enjoy outgoing and incoming IMS services.
  • FIG. 11 is a diagram showing an outgoing call bypass procedure at the time of AS failure according to the third embodiment of the present invention
  • FIG. 12 is a diagram showing an incoming call bypass procedure at the time of AS failure according to the third embodiment of the present invention. is there.
  • the basic configuration of the third embodiment of the present invention is the same as that of the IMS network according to the second embodiment of the present invention shown in FIG.
  • the present invention is applied when an application server (AS) that obtains subscriber data and provides various services in an IMS network fails.
  • AS application server
  • step d1 a description will be given of a call detour procedure at the time of an AS failure according to the third embodiment of the present invention.
  • the AS 3a has a node failure due to some factor (step d1).
  • the S-CSCF starts a health check procedure that is periodically executed, and transmits a SIP OPTIONS signal to the AS 3a (step d2). Since the AS 3a cannot receive the SIP OPTIONS signal because it is in a fault state, the S-CSCF detects a timeout waiting for the response of the SIP OPTIONS signal of the transmitted health check and recognizes that the AS 3a is in the fault state (Step d3).
  • the SIP terminal transmits a SIP INVITE signal to the P-CSCF in order to make a call request (step d4), and the P-CSCF that has received the SIP INVITE signal transmits a SIP INVITE signal to the S-CSCF (step d5). ).
  • the S-CSCF that has received the SIP INVITE signal tries to transmit the SIP INVITE signal to the AS 3a in order to perform outgoing call processing, but determines that a re-registration procedure is necessary because the AS 3a is in a failure state (step d6). ). In order to perform re-registration, the S-CSCF selects the AS 3b and transmits a SIP REGISTER signal (step d7).
  • the AS 3b that has received the SIP REGISTER signal performs a registration procedure with the HSS (step d8), acquires subscriber data, and transmits a SIP 200 OK signal to the S-CSCF (step d9).
  • the S-CSCF that has received the SIP 200 OK signal recognizes that the re-registration process to the AS 3b has been successful, continues the call request process from the SIP terminal (step d10), and sends the re-registration to the AS 3b that has performed the re-registration.
  • a SIP INVITE signal is transmitted (step d11).
  • step e1 an incoming call detouring procedure at the time of AS failure according to the third embodiment of the present invention will be described.
  • the AS 3a has a node failure due to some factor (step e1).
  • the S-CSCF starts a health check procedure that is periodically performed, and transmits a SIP OPTIONS signal to the AS 3a (step e2). Since the AS 3a cannot receive the SIP OPTIONS signal because it is in a fault state, the S-CSCF detects a timeout waiting for the response of the SIP OPTIONS signal of the transmitted health check and recognizes that the AS 3a is in the fault state (Step e3).
  • the S-CSCF When the S-CSCF receives the SIP INVITE signal of the incoming request (step e4), it tries to send the SIP INVITE signal to the AS 3a to perform the incoming request. However, since the AS 3a is in a failure state, the re-registration procedure Is determined to be necessary (step e5).
  • the S-CSCF selects the AS 3b and transmits a SIP REGISTER signal for re-registration (step e6).
  • the AS 3b that has received the SIP REGISTER signal performs a registration procedure with the HSS (step e7), acquires subscriber data, and transmits a SIP 200 OK signal to the S-CSCF (step e8).
  • the S-CSCF that has received the SIP 200 OK signal recognizes that the re-registration process to the AS 3b has succeeded, continues the incoming request process (step e9), and performs the SIP INVITE to the AS 3b that has performed the re-registration.
  • a signal is transmitted (step e10).
  • a node in an IMS network can recognize a node failure of an adjacent node by periodically performing a health check method using the SIP OPTIONS method with the adjacent node.
  • the node that has determined the failure can perform the re-registration procedure.
  • the user can continue to receive the incoming and outgoing IMS services.
  • a node failure of an adjacent node can be recognized, and the user can continuously enjoy outgoing and incoming IMS services.

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Abstract

Provided is a node device (1, 2b) of an IP multimedia subsystem which provides a multimedia service to a user by using SIP for controlling a multimedia communication including an audio. The node device includes: a health check unit (11, 21b) for performing a health check on an adjacent node device; and a recognition unit (12, 22b) which recognizes a failure state of the adjacent node device in accordance with the health check result obtained by the health check unit.

Description

ノード装置、通信システム及びサービス提供方法Node device, communication system, and service providing method
　本発明は、音声を含むマルチメディア通信の制御にＳＩＰ（Ｓｅｓｓｉｏｎ　Ｉｎｉｔｉａｔｉｏｎ　Ｐｒｏｔｏｃｏｌ）を利用したＩＭＳ（ＩＰ（Ｉｎｔｅｒｎｅｔ　Ｐｒｏｔｏｃｏｌ）　Ｍｕｌｔｉｍｅｄｉａ　Ｓｕｂｓｙｓｔｅｍ）のネットワークにおける、ノード装置、通信システム及びサービス提供方法に関する。 The present invention relates to a node device, a communication system, and a service providing method in an IMS (IP (Internet Protocol) Multimedia Subsystem) network that uses SIP (Session Initiation Protocol) to control multimedia communication including voice.
　音声を含むマルチメディア通信の制御にＳＩＰを利用してマルチメディアサービスをユーザに提供するシステムについて説明する。以下では、通信システムの一例として、ＩＭＳの場合を説明する。 A system for providing multimedia services to users using SIP for controlling multimedia communication including voice will be described. Below, the case of IMS is demonstrated as an example of a communication system.
　図１は、本発明に関連するＩＭＳネットワークにおけるレジストレーション制御を示している。図１に示すＰ－ＣＳＣＦ（Ｐｒｏｘｙ－Ｃａｌｌ　Ｓｅｓｓｉｏｎ　Ｃｏｎｔｒｏｌ　Ｆｕｎｃｔｉｏｎ）３１は、ＳＩＰ端末３５が最初にコンタクトするＳＩＰサーバである。ＡＳ（Ａｐｐｌｉｃａｔｉｏｎ　Ｓｅｒｖｅｒ）３３は、付加サービスを処理するサーバである。Ｓ－ＣＳＣＦ（Ｓｅｒｖｉｎｇ－Ｃａｌｌ　Ｓｅｓｓｉｏｎ　Ｃｏｎｔｒｏｌ　Ｆｕｎｃｔｉｏｎ）３２は、サービスの実行やセッションの制御を中心的に行うＳＩＰサーバであり、付加サービス実行時にＡＳ３３と通信する。ＨＳＳ（Ｈｏｍｅ　Ｓｕｂｓｃｒｉｂｅｒ　Ｓｅｒｖｅｒ）３４は加入者情報を管理するサーバである。 FIG. 1 shows registration control in an IMS network related to the present invention. A P-CSCF (Proxy-Call Session Control Function) 31 shown in FIG. 1 is a SIP server that the SIP terminal 35 contacts first. An AS (Application Server) 33 is a server that processes additional services. An S-CSCF (Serving-Call Session Control Function) 32 is a SIP server that mainly performs service execution and session control, and communicates with the AS 33 when additional services are executed. An HSS (Home Subscriber Server) 34 is a server that manages subscriber information.
　図１を参照して、ＩＭＳネットワークにおけるレジストレーション制御を説明する。ＳＩＰ端末３５はＳＩＰ　ＲＥＧＩＳＴＥＲ信号によるレジストレーション要求をＰ－ＣＳＣＦ３１へ送信する（ステップ４０１）。 Referring to FIG. 1, registration control in the IMS network will be described. The SIP terminal 35 transmits a registration request by the SIP REGISTER signal to the P-CSCF 31 (step 401).
　Ｐ－ＣＳＣＦ３１は、ＳＩＰ　ＲＥＧＩＳＴＥＲ信号によるレジストレーション要求をＳＩＰ端末３５から受信すると、ＲＥＧＩＳＴＥＲ送信先のＳ－ＣＳＣＦの情報をＨＳＳ３４から取得するため、ＤＩＡＭＥＴＥＲ　ＵＡＲ（Ｕｓｅｒ　Ａｕｔｈｏｒｉｚａｔｉｏｎ　Ｒｅｑｕｅｓｔ）／ＵＡＡ（Ｕｓｅｒ　Ａｕｔｈｏｒｉｚａｔｉｏｎ　Ａｎｓｗｅｒ）手順を行う（ステップ４０２）。 When the P-CSCF 31 receives a registration request by the SIP REGISTER signal from the SIP terminal 35, the P-CSCF 31 obtains information on the S-CSCF of the REGISTER transmission destination from the HSS 34. A procedure is performed (step 402).
　Ｐ－ＣＳＣＦ３１は、ＨＳＳ３４より取得したＳ－ＣＳＣＦの情報からＳ－ＣＳＣＦ３２を選択し、ＳＩＰ　ＲＥＧＩＳＴＥＲ信号を選択したＳ－ＣＳＣＦ３２へ送信する（ステップ４０３）。 The P-CSCF 31 selects the S-CSCF 32 from the S-CSCF information acquired from the HSS 34, and transmits the SIP REGISTER signal to the selected S-CSCF 32 (step 403).
　ＳＩＰ　ＲＥＧＩＳＴＥＲ信号を受信したＳ－ＣＳＣＦ３２は、ユーザの加入者データ及びＲＥＧＩＳＴＥＲ送信先のＡＳの情報を取得するため、ＤＩＡＭＥＴＥＲ　ＳＡＲ（Ｓｅｒｖｅｒ　Ａｓｓｉｇｎｍｅｎｔ　Ｒｅｑｕｅｓｔ）／ＳＡＡ（Ｓｅｒｖｅｒ　Ａｓｓｉｇｎｍｅｎｔ　Ａｎｓｗｅｒ）手順を行う（ステップ４０４）。 The S-CSCF 32 that has received the SIP REGISTER signal performs a DIAMETER SAR (Server Assignment Request) / SAA (Server Assignment Answer) procedure in order to acquire the subscriber data of the user and the AS information of the REGISTER destination (step 404). .
　Ｓ－ＣＳＣＦ３２は、ＨＳＳ３４より取得した加入者データを記憶し、ＨＳＳ３４より取得したＡＳの情報からＡＳ３３を選択し、ＳＩＰ　ＲＥＧＩＳＴＥＲ信号を選択したＡＳ３３へ送信する（ステップ４０５）。 The S-CSCF 32 stores the subscriber data acquired from the HSS 34, selects the AS 33 from the AS information acquired from the HSS 34, and transmits the SIP REGISTER signal to the selected AS 33 (step 405).
　ＳＩＰ　ＲＥＧＩＳＴＥＲ信号を受信したＡＳ３３は、ユーザのサービス加入者データを取得するため、ＤＩＡＭＥＴＥＲ　ＵＤＲ（Ｕｓｅｒ　Ｄａｔａ　Ｒｅｑｕｅｓｔ）／ＵＤＡ（Ｕｓｅｒ　Ｄａｔａ　Ａｎｓｗｅｒ）手順を行う（ステップ４０６）。 The AS 33 that has received the SIP REGISTER signal performs a DIAMETER UDR (User Data Request) / UDA (User Data Answer) procedure in order to acquire user service subscriber data (Step 406).
　本発明に関連するＩＭＳネットワークにおけるレジストレーション制御では、上述した４０１～４０６のレジストレーション手順によってユーザへのＩＭＳサービスを提供するＳ－ＣＳＣＦ、ＡＳが決定される。 In the registration control in the IMS network related to the present invention, the S-CSCF and AS that provide the IMS service to the user are determined by the registration procedures 401 to 406 described above.
　図２は、本発明に関連するＩＭＳネットワークにおけるＳ－ＣＳＣＦ障害時の発着信制御を示している。ここでは、Ｓ－ＣＳＣＦ３２ａが何らかの要因によって障害状態になったものとする（ステップ５０１）。 FIG. 2 shows outgoing / incoming control when the S-CSCF fails in the IMS network related to the present invention. Here, it is assumed that the S-CSCF 32a is in a failure state due to some factor (step 501).
　このＳ－ＣＳＣＦ３２ａの障害状態において、ＳＩＰ端末３５がＳＩＰ　ＩＮＶＩＴＥ信号による発信要求を、アクセスネットワーク３００を介してＰ－ＣＳＣＦ３１へ送信すると（ステップ５０２）、Ｐ－ＣＳＣＦ３１はレジストレーション時に決定されたＳ－ＣＳＣＦ３２ａへＳＩＰ　ＩＮＶＩＴＥ信号を送信する（ステップ５０３）。 When the SIP terminal 35 transmits a call request based on the SIP INVITE signal to the P-CSCF 31 via the access network 300 in the failure state of the S-CSCF 32a (step 502), the P-CSCF 31 is the S-S determined at the time of registration. A SIP INVITE signal is transmitted to the CSCF 32a (step 503).
　Ｓ－ＣＳＣＦ３２ａは障害状態であるため、Ｓ－ＣＳＣＦ３２ａは、ＳＩＰ　ＩＮＶＩＴＥ信号を受信することができず、Ｐ－ＣＳＣＦ３１に応答を返却しないので、Ｐ－ＣＳＣＦ３１はＳＩＰ　ＩＮＶＩＴＥ信号に対する応答待ちタイムアウトを検出する（ステップ５０４）。タイムアウトを検出したＰ－ＣＳＣＦ３１は、発信要求が受け付けられなかった旨のエラーを、アクセスネットワーク３００を介してＳＩＰ端末３５へ送出する（ステップ５０５）。 Since the S-CSCF 32a is in a failure state, the S-CSCF 32a cannot receive the SIP INVITE signal and does not return a response to the P-CSCF 31, so the P-CSCF 31 detects a response waiting timeout for the SIP INVITE signal. (Step 504). The P-CSCF 31 that has detected the timeout sends an error indicating that the call request has not been accepted to the SIP terminal 35 via the access network 300 (step 505).
　また、Ｓ－ＣＳＣＦ３２ｂは、着信要求を行うため、ＳＩＰ　ＩＮＶＩＴＥ信号をＳ－ＣＳＣＦ３２ａへ送信する（ステップ５０６）。Ｓ－ＣＳＣＦ３２ａは障害状態であるため、ＳＩＰ　ＩＮＶＩＴＥ信号を受信することができず、Ｓ－ＣＳＣＦ３２ｂに応答を返却しないので、Ｓ－ＣＳＣＦ３２ｂは、ＳＩＰ　ＩＮＶＩＴＥ信号に対する応答待ちタイムアウトを検出する（ステップ５０７）。 Also, the S-CSCF 32b transmits a SIP INVITE signal to the S-CSCF 32a in order to make an incoming call request (step 506). Since the S-CSCF 32a is in a failure state, it cannot receive the SIP INVITE signal and does not return a response to the S-CSCF 32b. Therefore, the S-CSCF 32b detects a response waiting timeout for the SIP INVITE signal (step 507). .
　なお、ＩＭＳネットワーク内において、ユーザ・デバイスにマルチメディア・リングバック・サービスを提供する方法及び装置が、特開２００６－１９１５９４号公報（以下では、特許文献１と称する）に開示されている。 A method and apparatus for providing a multimedia ringback service to a user device in an IMS network is disclosed in Japanese Patent Application Laid-Open No. 2006-191594 (hereinafter referred to as Patent Document 1).
　この特許文献１に開示された技術では、発呼者デバイスからの接続確立要求が、ＩＭＳネットワーク内で発呼者デバイスと被呼者デバイスとの間に接続を確立する働きをし、接続確立要求に応答して、発呼者デバイスとの間に少なくとも１つのマルチメディア・セッションを確立する働きをするマルチメディア・コンテンツ情報を取得し、接続の確率と同時に、発呼者デバイスにマルチメディア・コンテンツ情報の少なくとも一部を送信している。 In the technique disclosed in Patent Document 1, a connection establishment request from a calling party device serves to establish a connection between a calling party device and a called party device in an IMS network, and a connection establishment request is made. In response to obtaining multimedia content information that serves to establish at least one multimedia session with the calling party device, and simultaneously with the probability of connection, the multimedia content to the calling party device Send at least some of the information.
　本発明に関連するＩＭＳネットワークでは、レジストレーション時に該当ユーザの発着信サービスを行うＳ－ＣＳＣＦ、ＡＳが選択される。そのため、レジストレーション時に選択されたＩＭＳノードが何らかの要因によってノード障害となった場合、ユーザからのデレジストレーションによって別のＩＭＳノードへの再割り当てが行われない限り、障害ノードが復旧するまでの間、発着信をはじめとするサービスを提供することができないという課題がある。 In the IMS network related to the present invention, the S-CSCF and AS that perform the outgoing / incoming service of the corresponding user at the time of registration are selected. Therefore, if the IMS node selected at the time of registration becomes a node failure due to some cause, the re-assignment to another IMS node is not performed by the deregistration from the user until the failed node is recovered. However, there is a problem that services such as outgoing and incoming calls cannot be provided.
　つまり、本発明に関連するＩＭＳネットワークでは、加入者データをレジストレーション時に取得するＳ－ＣＳＣＦ及びＡＳが何らかの要因でノード障害となると、ユーザが、デレジストレーション手順が実施されて加入者データを有する呼制御サービスノード（Ｓ－ＣＳＣＦ、ＡＳ）が新たに割り当てられるまで発着信サービスを享受できないという問題がある。 In other words, in the IMS network related to the present invention, when the S-CSCF and AS that acquire subscriber data at the time of registration cause a node failure for some reason, the user has the subscriber data after the deregistration procedure is performed. There is a problem in that the outgoing / incoming service cannot be enjoyed until a new call control service node (S-CSCF, AS) is assigned.
　また、本発明に関連するＩＭＳネットワークでは、上記のように、ユーザがレジストレーション時に割り当てられたＳ－ＣＳＣＦ３２Ａが障害状態になると、発着信のサービスを提供することができない。さらに、本発明に関連するＩＭＳネットワークでは、ＡＳ障害時の発着信制御についても、発着信をはじめとするサービス提供において上記と同様の課題がある。 Also, in the IMS network related to the present invention, as described above, when the S-CSCF 32A assigned by the user at the time of registration becomes a failure state, the outgoing / incoming service cannot be provided. Furthermore, in the IMS network related to the present invention, there is a problem similar to the above in providing services such as outgoing / incoming calls in regard to outgoing / incoming control at the time of AS failure.
　なお、上記の特許文献１に記載の技術では、ユーザ・デバイスにマルチメディア・リングバック・サービスを提供することが記載されているのみで、上記のレジストレーション時の障害、ＡＳ障害時については何ら記載されていないので、上記の問題を解決することはできない。 Note that the technique described in Patent Document 1 only describes providing a multimedia ringback service to a user device, and there is no problem regarding the above-described registration failure or AS failure. Since it is not described, the above problem cannot be solved.
　本発明の目的の一例は、隣接ノードのノード障害を認識することができ、ユーザが発着信のＩＭＳサービスを継続して享受することができるノード装置、通信システム及びサービス提供方法を提供することである。 An example of an object of the present invention is to provide a node device, a communication system, and a service providing method that can recognize a node failure of an adjacent node and allow a user to continuously enjoy outgoing and incoming IMS services. is there.
　本発明の一側面のノード装置は、音声を含むマルチメディア通信の制御にＳＩＰを利用してマルチメディアサービスをユーザに提供するＩＰマルチメディアサブシステムのノード装置であって、隣接するノード装置に対してヘルスチェックを実施するヘルスチェック部と、ヘルスチェック部によるヘルスチェックの結果に基づいて隣接するノード装置の障害状態を認識する認識部と、を有する構成である。 A node device according to an aspect of the present invention is a node device of an IP multimedia subsystem that provides a multimedia service to a user using SIP for control of multimedia communication including voice, and for a neighboring node device. A health check unit that performs a health check and a recognition unit that recognizes a failure state of an adjacent node device based on a result of the health check by the health check unit.
　本発明の一側面の通信システムは、上記本発明の一側面のノード装置を複数有する構成である。 A communication system according to one aspect of the present invention has a configuration including a plurality of node devices according to one aspect of the present invention.
　本発明の一側面のサービス提供方法は、音声を含むマルチメディア通信の制御にＳＩＰを利用してマルチメディアサービスをユーザに提供するＩＰマルチメディアサブシステムのノード装置によるサービス提供方法であって、隣接するノード装置に対してヘルスチェックを実施するヘルスチェック処理と、ヘルスチェック処理によるヘルスチェックの結果に基づいて隣接するノード装置の障害状態を認識する認識処理と、を行うものである。 A service providing method according to an aspect of the present invention is a service providing method by a node device of an IP multimedia subsystem that provides a multimedia service to a user using SIP for controlling multimedia communication including voice. A health check process for performing a health check on the node device to be recognized, and a recognition process for recognizing a failure state of an adjacent node device based on a result of the health check by the health check process.
図１は本発明に関連するＩＭＳネットワークにおけるレジストレーション制御を示す図である。FIG. 1 is a diagram showing registration control in an IMS network related to the present invention. 図２は本発明に関連するＩＭＳネットワークにおけるＳ－ＣＳＣＦ障害時の発着信制御を示す図である。FIG. 2 is a diagram showing outgoing / incoming control when the S-CSCF fails in the IMS network related to the present invention. 図３は本発明によるＩＭＳネットワークの構成例を示すブロック図である。FIG. 3 is a block diagram showing a configuration example of an IMS network according to the present invention. 図４は本発明の第１の実施の形態によるＩＭＳネットワークにおける隣接ノードへのＳＩＰ　ＯＰＴＩＯＮＳヘルスチェック手順を示す図である。FIG. 4 is a diagram showing a SIP OPTIONS health check procedure for adjacent nodes in the IMS network according to the first embodiment of the present invention. 図５は本発明の第１の実施の形態におけるＳ－ＣＳＣＦ障害時の隣接ノードによる発信迂回制御手順を示す図である。FIG. 5 is a diagram showing a call detour control procedure by an adjacent node when the S-CSCF fails in the first embodiment of the present invention. 図６は本発明の第１の実施の形態におけるＳ－ＣＳＣＦ障害時の隣接ノードによる着信迂回制御手順を示す図である。FIG. 6 is a diagram showing an incoming call detour control procedure by an adjacent node when the S-CSCF fails in the first embodiment of this invention. 図７は本発明の第２の実施の形態におけるＩＭＳネットワークの構成例を示すブロック図である。FIG. 7 is a block diagram showing a configuration example of an IMS network in the second exemplary embodiment of the present invention. 図８は本発明の第２の実施の形態におけるＩＭＳレジストレーション手順を示す図である。FIG. 8 is a diagram showing an IMS registration procedure in the second embodiment of the present invention. 図９は本発明の第２の実施の形態におけるＳ－ＣＳＣＦ障害時の発信迂回制御手順を示す図である。FIG. 9 is a diagram showing a call detour control procedure when the S-CSCF fails in the second embodiment of the present invention. 図１０は本発明の第２の実施の形態におけるＳ－ＣＳＣＦ障害時の着信迂回制御手順を示す図である。FIG. 10 is a diagram showing an incoming call detour control procedure when the S-CSCF fails in the second embodiment of the present invention. 図１１は本発明の第３の実施の形態におけるＡＳ障害時の発信迂回手順を示す図である。FIG. 11 is a diagram showing an outgoing call detouring procedure at the time of an AS failure in the third embodiment of the present invention. 図１２は本発明の第３の実施の形態におけるＡＳ障害時の着信迂回手順を示す図である。FIG. 12 is a diagram showing an incoming call detouring procedure at the time of AS failure in the third embodiment of the present invention.
符号の説明Explanation of symbols
　１　　Ｐ－ＣＳＣＦ
　２、２ａ、２ｂ、２ｃ　　Ｓ－ＣＳＣＦ
　３、３ａ、３ｂ　　ＡＳ
　４　　ＨＳＳ
　５　　ＳＩＰ端末
　１１，２１ａ，２１ｂ　　ヘルスチェック部
　１２，２２ａ，２２ｂ　　対向ノード障害認識部
　１３，２３ａ，２３ｂ　　再レジストレーション手順実施部
　１００　　アクセスネットワーク 1 P-CSCF
2, 2a, 2b, 2c S-CSCF
3, 3a, 3b AS
4 HSS
5 SIP terminal 11, 21a, 21b Health check unit 12, 22a, 22b Opposite node failure recognition unit 13, 23a, 23b Re-registration procedure execution unit 100 Access network
　次に、本発明の実施の形態について図面を参照して説明する。図３は本発明によるＩＭＳネットワークの構成例を示すブロック図である。 Next, embodiments of the present invention will be described with reference to the drawings. FIG. 3 is a block diagram showing a configuration example of an IMS network according to the present invention.
　図３において、本発明によるＩＭＳネットワークは、Ｐ－ＣＳＣＦ１と、Ｓ－ＣＳＣＦ２ａと、Ｓ－ＣＳＣＦ２ｂとを有する構成である。 3, the IMS network according to the present invention has a configuration having a P-CSCF 1, an S-CSCF 2a, and an S-CSCF 2b.
　Ｐ－ＣＳＣＦ１は、ＩＭＳノード間（Ｐ－ＣＳＣＦ１とＳ－ＣＳＣＦ２ａとの間）でのＳＩＰ　ＯＰＴＩＯＮＳメソッドによるヘルスチェックを行うヘルスチェック部１１と、ヘルスチェック部１１のチェック結果に基づいて、対向するＩＭＳノード（Ｓ－ＣＳＣＦ２ａ）の障害を検出する対向ノード障害認識部１２とを備えている。 The P-CSCF 1 is a health check unit 11 that performs a health check using the SIP OPTIONS method between IMS nodes (between the P-CSCF 1 and the S-CSCF 2 a), and the opposing IMS based on the check result of the health check unit 11. And an opposite node failure recognition unit 12 that detects a failure of the node (S-CSCF2a).
　同様に、Ｓ－ＣＳＣＦ２ｂは、ＩＭＳノード間（Ｓ－ＣＳＣＦ２ｂとＳ－ＣＳＣＦ２ａとの間）でのＳＩＰ　ＯＰＴＩＯＮＳメソッドによるヘルスチェックを行うヘルスチェック部２１ｂと、ヘルスチェック部２１ｂのチェック結果に基づいて、対向するＩＭＳノード（Ｓ－ＣＳＣＦ２ａ）の障害を検出する対向ノード障害認識部２２ｂとを備えている。なお、図示していないが、Ｓ－ＣＳＣＦ２ａも、上記のＳ－ＣＳＣＦ２ｂと同様の構成となっている。 Similarly, the S-CSCF 2b is based on the health check unit 21b that performs a health check using the SIP OPTIONS method between IMS nodes (between the S-CSCF 2b and the S-CSCF 2a), and the check result of the health check unit 21b. And an opposing node failure recognition unit 22b that detects a failure of the opposing IMS node (S-CSCF2a). Although not shown, the S-CSCF 2a has the same configuration as the S-CSCF 2b.
　Ｐ－ＣＳＣＦ１は、対向するＳ－ＣＳＣＦ２ａへ周期的に、通信相手の能力や状態を問い合わせるためのＳＩＰ　ＯＰＴＩＯＮＳを送信する。Ｓ－ＣＳＣＦ２ａは、ＳＩＰ　ＯＰＴＩＯＮＳによるヘルスチェック要求を受信すると、Ｐ－ＣＳＣＦ１へヘルスチェック正常を意味するＳＩＰ　２００　ＯＫ（ＯＰＴＩＯＮＳ）を送信する。 The P-CSCF 1 periodically transmits SIP OPTIONS for inquiring about the capability and status of the communication partner to the opposing S-CSCF 2 a. When the S-CSCF 2a receives a health check request by SIP OPTIONS, the S-CSCF 2a transmits SIP 200 OK (OPTIONS) indicating that the health check is normal to the P-CSCF 1.
　これによって、Ｐ－ＣＳＣＦ１は、対向するＳ－ＣＳＣＦ２ａのノード状態が正常であることを認識することが可能となる。また、Ｐ－ＣＳＣＦ１は、ヘルスチェック応答である２００　ＯＫ（ＯＰＴＩＯＮＳ）を受信しない場合、対向するＳ－ＣＳＣＦ２ａが障害状態であることを認識することが可能となる。 Thereby, the P-CSCF 1 can recognize that the node state of the opposing S-CSCF 2a is normal. In addition, when the P-CSCF 1 does not receive the health check response 200 OK (OPTIONS), the P-CSCF 1 can recognize that the opposing S-CSCF 2 a is in a failure state.
　同様に、Ｓ－ＣＳＣＦ２ｂは、対向するＳ－ＣＳＣＦ２ａへ周期的にＳＩＰ　ＯＰＴＩＯＮＳを送信する。Ｓ－ＣＳＣＦ２ａは、ＳＩＰ　ＯＰＴＩＯＮＳによるヘルスチェック要求を受信すると、Ｓ－ＣＳＣＦ２ｂへヘルスチェック正常を意味するＳＩＰ　２００　ＯＫ（ＯＰＴＩＯＮＳ）を送信する。 Similarly, the S-CSCF 2b periodically transmits the SIP OPTIONS to the opposing S-CSCF 2a. When the S-CSCF 2a receives the health check request by SIP OPTIONS, it transmits SIP 200 OK (OPTIONS) indicating that the health check is normal to the S-CSCF 2b.
　これによって、Ｓ－ＣＳＣＦ２ｂは、対向するＳ－ＣＳＣＦ２ａのノード状態が正常であることを認識することが可能となる。また、Ｓ－ＣＳＣＦ２ｂは、ヘルスチェック応答である２００　ＯＫ（ＯＰＴＩＯＮＳ）を受信しない場合、対向するＳ－ＣＳＣＦ２ａが障害状態であることを認識することが可能となる。 Thereby, the S-CSCF 2b can recognize that the node state of the opposing S-CSCF 2a is normal. Further, when the S-CSCF 2b does not receive the health check response 200 OK (OPTIONS), the S-CSCF 2b can recognize that the opposing S-CSCF 2a is in a failure state.
　このように、本発明では、ＩＭＳノード間でのＳＩＰ　ＯＰＴＩＯＮＳメソッドによるヘルスチェック方式を規定することで、隣接ノードの障害状態を認識することが可能となる。これによって、隣接ノードでは、ユーザからの発信サービス要求時及びユーザへの着信要求時に発着信サービスが提供できない状態であることを認識することが可能となる。 As described above, in the present invention, it is possible to recognize a failure state of an adjacent node by defining a health check method using the SIP OPTIONS method between IMS nodes. As a result, the adjacent node can recognize that the outgoing / incoming service cannot be provided at the time of the outgoing call request from the user and the incoming call request to the user.
　（第１の実施の形態）
　次に、本発明の第１の実施の形態について図４～図６を参照して説明する。 (First embodiment)
Next, a first embodiment of the present invention will be described with reference to FIGS.
　図４は本発明の第１の実施の形態によるＩＭＳネットワークにおける隣接ノードへのＳＩＰ　ＯＰＴＩＯＮＳヘルスチェック手順を示している。図５は本発明の第１の実施の形態によるＳ－ＣＳＣＦ障害時の隣接ノードによる発信迂回制御手順を示している。図６は本発明の第１の実施の形態によるＳ－ＣＳＣＦ障害時の隣接ノードによる着信迂回制御手順を示している。 FIG. 4 shows a SIP OPTIONS health check procedure for adjacent nodes in the IMS network according to the first embodiment of the present invention. FIG. 5 shows an outgoing call detour control procedure by the adjacent node when the S-CSCF fails according to the first embodiment of the present invention. FIG. 6 shows an incoming call detour control procedure by an adjacent node when the S-CSCF fails according to the first embodiment of the present invention.
　本発明の第１の実施の形態は、ＩＭＳネットワークにおいて、ＳＩＰ　ＯＰＴＩＯＮＳによるヘルスチェック方式を実施することで、隣接ノードの障害状態を認識することが可能となる。これによって、本実施の形態は、呼制御を行うＳ－ＣＳＣＦ及びＡＳがノード障害となった場合でも、ノード障害を検出した隣接ノードが再レジストレーションによる迂回制御を行うことで、発着信をはじめとするＩＭＳサービスをユーザへ提供することが可能となる。 In the first embodiment of the present invention, it is possible to recognize a failure state of an adjacent node by implementing a health check method based on SIP OPTIONS in an IMS network. As a result, in this embodiment, even when the S-CSCF and AS that perform call control have a node failure, the neighboring node that detects the node failure performs bypass control by re-registration, so It is possible to provide the IMS service to the user.
　図４には、ＩＭＳネットワークにおけるＳＩＰ　ＯＰＴＩＯＮＳによるヘルスチェック手順を示している。また、図４において、本発明の第１の実施の形態によるＩＭＳネットワークは、Ｐ－ＣＳＣＦ１と、Ｓ－ＣＳＣＦ２ａと、Ｓ－ＣＳＣＦ２ｂと、ＡＳ３とから構成されている。 FIG. 4 shows a health check procedure by SIP OPTIONS in the IMS network. In FIG. 4, the IMS network according to the first embodiment of the present invention includes a P-CSCF 1, an S-CSCF 2a, an S-CSCF 2b, and an AS 3.
　Ｐ－ＣＳＣＦ１は、上記のヘルスチェック部１１及び対向ノード障害認識部１２と、対向ノード障害認識部１２でノード障害を検出した時にＳＩＰ　ＭＥＳＳＡＧＥメソッドによる再レジストレーション手順を実施する再レジストレーション手順実施部１３とを備えている。 The P-CSCF 1 includes the health check unit 11 and the opposing node failure recognition unit 12, and a re-registration procedure execution unit that executes a re-registration procedure using the SIP MESSAGE method when the opposing node failure recognition unit 12 detects a node failure. 13.
　Ｓ－ＣＳＣＦ２ａ及びＳ－ＣＳＣＦ２ｂは、上記のヘルスチェック部２１ａ，２１ｂ及び対向ノード障害認識部２２ａ，２２ｂと、対向ノード障害認識部２２ａ，２２ｂでノード障害を検出した時にＳＩＰ　ＭＥＳＳＡＧＥメソッドによる再レジストレーション手順を実施する再レジストレーション手順実施部２３ａ，２３ｂとを備えている。 The S-CSCF 2a and S-CSCF 2b perform re-registration by the SIP MESSAGE method when the health check units 21a and 21b, the opposing node failure recognition units 22a and 22b, and the opposing node failure recognition units 22a and 22b detect a node failure. And a re-registration procedure execution unit 23a, 23b for executing the procedure.
　以下、ＩＭＳネットワークにおけるＳＩＰ　ＯＰＴＩＯＮＳによるヘルスチェック手順について説明する。Ｐ－ＣＳＣＦ１は、ヘルスチェック部１１によって対向するＳ－ＣＳＣＦ２ａへ周期的に、通信相手の能力や状態を問い合わせるためのＳＩＰ　ＯＰＴＩＯＮＳを送信する（ステップ１０１）。 Hereinafter, the health check procedure by SIP OPTIONS in the IMS network will be described. The P-CSCF 1 periodically sends SIP OPTIONS for inquiring about the capability and state of the communication partner to the opposing S-CSCF 2a by the health check unit 11 (step 101).
　Ｓ－ＣＳＣＦ２ａは、ＳＩＰ　ＯＰＴＩＯＮＳによるヘルスチェック要求を受信すると、ヘルスチェック正常を意味するＳＩＰ　２００　ＯＫ（ＯＰＴＩＯＮＳ）をＰ－ＣＳＣＦ１へ送信する（ステップ１０２）。なお、ＳＩＰ　２００　ＯＫ（ＯＰＴＩＯＮＳ）は、ヘルスチェック部２１ａからＰ－ＣＳＣＦ１へ送信される。 When the health check request by SIP OPTIONS is received, the S-CSCF 2a transmits SIP 200 OK (OPTIONS) indicating normal health check to the P-CSCF 1 (step 102). Note that SIP 200 OK (OPTIONS) is transmitted from the health check unit 21a to the P-CSCF1.
　これによって、Ｐ－ＣＳＣＦ１の対向ノード障害認識部１２は、対向するＳ－ＣＳＣＦ２ａのノード状態が正常であることを認識することが可能となる。また、Ｐ－ＣＳＣＦ１の対向ノード障害認識部１２は、ヘルスチェック応答である２００　ＯＫ（ＯＰＴＩＯＮＳ）を受信しない場合、対向するＳ－ＣＳＣＦ２ａが障害状態であることを認識することが可能となる。 Thereby, the opposing node failure recognition unit 12 of the P-CSCF 1 can recognize that the node state of the opposing S-CSCF 2a is normal. Further, the opposite node failure recognition unit 12 of the P-CSCF 1 can recognize that the opposite S-CSCF 2a is in a failure state when it does not receive 200 OK (OPTIONS) as a health check response.
　同様に、Ｓ－ＣＳＣＦ２ａは、ヘルスチェック部２１ａによって対向するＡＳ３へ周期的にＳＩＰ　ＯＰＴＩＯＮＳを送信する（ステップ１０３）。ＡＳ３はＳＩＰ　ＯＰＴＩＯＮＳによるヘルスチェック要求を受信すると、ヘルスチェック正常を意味するＳＩＰ　２００　ＯＫ（ＯＰＴＩＯＮＳ）をＳ－ＣＳＣＦ２ａへ送信する（ステップ１０４）。 Similarly, the S-CSCF 2a periodically transmits SIP OPTIONS to the opposing AS 3 by the health check unit 21a (step 103). When the AS 3 receives the health check request from the SIP OPTIONS, the AS 3 transmits SIP 200 OK (OPTIONS) indicating normal health check to the S-CSCF 2a (step 104).
　これによって、Ｓ－ＣＳＣＦ２ａの対向ノード障害認識部２２ａは、対向するＡＳ３のノード状態が正常であることを認識することが可能となる。また、Ｓ－ＣＳＣＦ２ａの対向ノード障害認識部２２ａは、ヘルスチェック応答である２００　ＯＫ（ＯＰＴＩＯＮＳ）を受信しない場合、対向するＡＳ３が障害状態であることを認識することが可能となる。 Thereby, the opposite node failure recognition unit 22a of the S-CSCF 2a can recognize that the node state of the opposite AS 3 is normal. Further, the opposite node failure recognition unit 22a of the S-CSCF 2a can recognize that the opposite AS 3 is in a failure state when the health check response 200 OK (OPTIONS) is not received.
　Ｓ－ＣＳＣＦ２ｂは、ヘルスチェック部２１ｂによって対向するＳ－ＣＳＣＦ２ａへ周期的にＳＩＰ　ＯＰＴＩＯＮＳを送信する（ステップ１０５）。Ｓ－ＣＳＣＦ２ａは、ＳＩＰ　ＯＰＴＩＯＮＳによるヘルスチェック要求を受信すると、Ｓ－ＣＳＣＦ２ｂへヘルスチェック正常を意味するＳＩＰ　２００　ＯＫ（ＯＰＴＩＯＮＳ）を送信する（ステップ１０６）。この場合も、ＳＩＰ　２００　ＯＫ（ＯＰＴＩＯＮＳ）は、ヘルスチェック部２１ａからＳ－ＣＳＣＦ２ｂへ送信される。 The S-CSCF 2b periodically transmits SIP OPTIONS to the opposing S-CSCF 2a by the health check unit 21b (step 105). Upon receiving the health check request by SIP OPTIONS, the S-CSCF 2a transmits SIP 200 OK (OPTIONS) indicating that the health check is normal to the S-CSCF 2b (step 106). Also in this case, SIP 200 OK (OPTIONS) is transmitted from the health check unit 21a to the S-CSCF 2b.
　これによって、Ｓ－ＣＳＣＦ２ｂの対向ノード障害認識部２２ｂは、対向するＳ－ＣＳＣＦ２ａのノード状態が正常であることを認識することが可能となる。また、Ｓ－ＣＳＣＦ２ｂの対向ノード障害認識部２２ｂは、ヘルスチェック応答である２００　ＯＫ（ＯＰＴＩＯＮＳ）を受信しない場合、対向するＳ－ＣＳＣＦ２ａが障害状態であることを認識することが可能となる。 Thereby, the opposing node failure recognition unit 22b of the S-CSCF 2b can recognize that the node state of the opposing S-CSCF 2a is normal. Further, the opposite node failure recognition unit 22b of the S-CSCF 2b can recognize that the opposite S-CSCF 2a is in a failure state when the health check response 200 OK (OPTIONS) is not received.
　図５には、Ｓ－ＣＳＣＦが何らかの要因によって障害状態となった場合の発信迂回制御手順を示している。図５において、Ｐ－ＣＳＣＦ１、Ｓ－ＣＳＣＦ２ａ、Ｓ－ＣＳＣＦ２ｂは、上記の図４に示す構成と同様の構成とする。また、Ｓ－ＣＳＣＦ２ａは何らかの要因で障害状態になったものとする（ステップ２０１）。 FIG. 5 shows an outgoing call detour control procedure when the S-CSCF enters a failure state due to some cause. In FIG. 5, P-CSCF1, S-CSCF2a, and S-CSCF2b have the same configuration as that shown in FIG. Further, it is assumed that the S-CSCF 2a enters a failure state for some reason (step 201).
　Ｐ－ＣＳＣＦ１は、周期的に実施している上記のヘルスチェックを起動すると、ＳＩＰ　ＯＰＴＩＯＮＳ信号をＳ－ＣＳＣＦ２ａへ送信する（ステップ２０２）。Ｓ－ＣＳＣＦ２ａは障害状態であるため、ＳＩＰ　ＯＰＴＩＯＮＳ信号を受信することができず、ヘルスチェック応答を返却することができない。このため、ヘルスチェックのＳＩＰ　ＯＰＴＩＯＮＳ信号を送信したＰ－ＣＳＣＦ１は、応答待ちタイムアウトを検出し、対向するＳ－ＣＳＣＦ２ａが障害状態であることを認識する（ステップ２０３）。 When the P-CSCF 1 starts the health check that is periodically performed, the P-CSCF 1 transmits a SIP OPTIONS signal to the S-CSCF 2a (step 202). Since the S-CSCF 2a is in a fault state, the SIP OPTIONS signal cannot be received and a health check response cannot be returned. For this reason, the P-CSCF 1 that has transmitted the SIP OPTIONS signal of the health check detects a response wait timeout and recognizes that the opposing S-CSCF 2a is in a failure state (step 203).
　ＳＩＰ端末５は、発信要求を行うため、レジストレーション時に決定されたＰ－ＣＳＣＦ１へアクセスネットワーク１００を介してＳＩＰ　ＩＮＶＩＴＥ信号を送出する（ステップ２０４）。 The SIP terminal 5 sends a SIP INVITE signal via the access network 100 to the P-CSCF 1 determined at the time of registration in order to make a call request (step 204).
　ＳＩＰ　ＩＮＶＩＴＥ信号を受信したＰ－ＣＳＣＦ１は、発信処理を行うため、レジストレーション時に選択したＳ－ＣＳＣＦ２ａへＳＩＰ　ＩＮＶＩＴＥ信号を送信しようとするが、Ｓ－ＣＳＣＦ２ａが障害状態であるので、ＳＩＰ端末５へレジストレーション要求を意味するＳＩＰ　ＭＥＳＳＡＧＥ信号（再ＲＥＧ要求）を送信する（ステップ２０５）。なお、ＳＩＰ　ＭＥＳＳＡＧＥ信号（再ＲＥＧ要求）は、図４に示すＰ－ＣＳＣＦ１の再レジストレーション手順実施部１３からＳＩＰ端末５へ送信される。 The P-CSCF 1 that has received the SIP INVITE signal tries to transmit the SIP INVITE signal to the S-CSCF 2a selected at the time of registration in order to perform the outgoing call processing. However, since the S-CSCF 2a is in a failure state, the P-CSCF 1 A SIP MESSAGE signal (re-REG request) indicating a registration request is transmitted (step 205). Note that the SIP MESSAGE signal (re-REG request) is transmitted from the re-registration procedure execution unit 13 of the P-CSCF 1 shown in FIG.
　ＳＩＰ　ＭＥＳＳＡＧＥ信号を受信したＳＩＰ端末５は、再レジストレーション要求であることを判断し、ＳＩＰ　ＭＥＳＳＡＧＥ信号の送信元のＰ－ＣＳＣＦ１へＳＩＰ　ＲＥＧＩＳＴＥＲ信号を送出する（ステップ２０６）。 The SIP terminal 5 that has received the SIP MESSAGE signal determines that it is a re-registration request, and sends a SIP REGISTER signal to the P-CSCF 1 that is the source of the SIP MESSAGE signal (step 206).
　ＳＩＰ　ＲＥＧＩＳＴＥＲ信号を受信したＰ－ＣＳＣＦ１は、該当ユーザの再レジストレーション手順を実施するため、ＨＳＳ４へＤＩＡＭＥＴＥＲ　ＵＡＲ／ＵＡＡ手順を実施する（ステップ２０７）。 Upon receiving the SIP REGISTER signal, the P-CSCF 1 performs the DIAMETER UAR / UAA procedure to the HSS 4 in order to perform the re-registration procedure of the corresponding user (step 207).
　Ｐ－ＣＳＣＦ１は、ＨＳＳ４よりＵＡＲ／ＵＡＡ手順で取得したＳ－ＣＳＣＦの情報から障害状態であるＳ－ＣＳＣＦ２ａ以外のＳ－ＣＳＣＦ２ｂを選択し、ＳＩＰ　ＲＥＧＩＳＴＥＲ信号をＳ－ＣＳＣＦ２ｂへ送信する（ステップ２０８）。ＳＩＰ　ＲＥＧＩＳＴＥＲ信号を受信したＳ－ＣＳＣＦ２ｂは、ＨＳＳ４及びＡＳ３と連携し、通常のレジストレーション処理を実施する（ステップ２０９）。 The P-CSCF 1 selects an S-CSCF 2b other than the S-CSCF 2a in a failed state from the S-CSCF information acquired from the HSS 4 by the UAR / UAA procedure, and transmits a SIP REGISTER signal to the S-CSCF 2b (step 208). . The S-CSCF 2b that has received the SIP REGISTER signal performs normal registration processing in cooperation with the HSS 4 and AS 3 (step 209).
　レジストレーションが完了すると、Ｐ－ＣＳＣＦ１は、新たにレジストレーションを行ったＳ－ＣＳＣＦ２ｂにＳＩＰ　ＩＮＶＩＴＥ信号を送信し、発信処理を継続する（ステップ２１０）。 When the registration is completed, the P-CSCF 1 transmits a SIP INVITE signal to the newly registered S-CSCF 2b and continues the calling process (step 210).
　以上の手順によって、本実施の形態では、Ｓ－ＣＳＣＦ２ａが障害状態になった場合でも、再レジストレーション処理を実施することで、ユーザが発信サービスを継続することが可能となる。 According to the above procedure, in the present embodiment, even when the S-CSCF 2a is in a failure state, it is possible for the user to continue the calling service by performing the re-registration process.
　図６には、Ｓ－ＣＳＣＦが何らかの要因によって障害状態となった場合の着信制御手順を示している。この場合、Ｓ－ＣＳＣＦ２ａは何らかの要因で障害状態になったものとする（ステップ３０１）。 FIG. 6 shows an incoming call control procedure when the S-CSCF enters a failure state for some reason. In this case, it is assumed that the S-CSCF 2a has entered a failure state for some reason (step 301).
　Ｓ－ＣＳＣＦ２ｂは、周期的に実施している上記のヘルスチェックを起動すると、ＳＩＰ　ＯＰＴＩＯＮＳ信号をＳ－ＣＳＣＦ２ａへ送信する（ステップ３０２）。Ｓ－ＣＳＣＦ２ａは障害状態であるため、ＳＩＰ　ＯＰＴＩＯＮＳ信号を受信することができず、ヘルスチェック応答を返却することができない。このため、ヘルスチェックのＳＩＰ　ＯＰＴＩＯＮＳ信号を送信したＳ－ＣＳＣＦ２ｂは、応答待ちタイムアウトを検出し、対向するＳ－ＣＳＣＦ２ａが障害状態であることを認識する（ステップ３０３）。 When the S-CSCF 2b starts the health check that is periodically performed, the S-CSCF 2b transmits a SIP OPTIONS signal to the S-CSCF 2a (step 302). Since the S-CSCF 2a is in a fault state, the SIP OPTIONS signal cannot be received and a health check response cannot be returned. For this reason, the S-CSCF 2b that has transmitted the SIP OPTIONS signal of the health check detects a response wait timeout and recognizes that the opposing S-CSCF 2a is in a failure state (step 303).
　Ｓ－ＣＳＣＦ２ｂは、着信者が収容されるＳ－ＣＳＣＦ２ａを、ＨＳＳ４とＤＩＡＭＥＴＥＲ　ＬＩＲ（Ｌｏｃａｔｉｏｎ　Ｉｎｆｏ　Ｒｅｑｕｅｓｔ）／ＬＩＡ（Ｌｏｃａｔｉｏｎ　Ｉｎｆｏ　Ａｎｓｗｅｒ）手順とによって特定し、Ｓ－ＣＳＣＦ２ａへ着信要求を行うため、ＳＩＰ　ＩＮＶＩＴＥ信号をＳ－ＣＳＣＦ２ａへ送信しようとする。 The S-CSCF 2b specifies the S-CSCF 2a in which the called party is accommodated by the HSS 4 and the DIAMETER LIR (Location Info Request) / LIA (Location Info Answer) procedure, and makes an incoming request to the S-CSCF 2a. An attempt is made to transmit a signal to the S-CSCF 2a.
　しかしながら、Ｓ－ＣＳＣＦ２ａのノードが障害状態であるため、Ｓ－ＣＳＣＦ２ｂは、Ｓ－ＣＳＣＦ２ｂと対向する別のＳ－ＣＳＣＦ２ｃを選択し、Ｓ－ＣＳＣＦ２ｃへＳＩＰ　ＩＮＶＩＴＥ信号を送信する（ステップ３０４）。 However, since the node of the S-CSCF 2a is in a failure state, the S-CSCF 2b selects another S-CSCF 2c opposite to the S-CSCF 2b and transmits a SIP INVITE signal to the S-CSCF 2c (step 304).
　ＳＩＰ　ＩＮＶＩＴＥ信号を受信したＳ－ＣＳＣＦ２ｃは、着信要求を受信したユーザのプロファイルが存在しないので、ＨＳＳ４へＵＮＲＥＧＩＳＴＥＲＥＤ　ＳＥＲＶＩＣＥ手順を行うため、ＨＳＳ４へＤＩＡＭＥＴＥＲ　ＳＡＲ信号を送信する（ステップ３０５）。 The S-CSCF 2c that has received the SIP INVITE signal transmits a DIAMETER SAR signal to the HSS 4 in order to perform the UNREGISTERED SERVICE procedure to the HSS 4 because there is no profile of the user who has received the incoming call request (step 305).
　ＤＩＡＭＥＴＥＲ　ＳＡＲによるＵＮＲＥＧＩＳＴＥＲＤ　ＳＥＲＶＩＣＥ要求受信したＨＳＳ４は、ユーザがレジストレーション状態であることから障害時の迂回着信が発生していることを認識し、該当ユーザがレジストレーションされているＰ－ＣＳＣＦの情報、ＳＩＰ端末５のＣｏｎｔａｃｔアドレス情報をＤＩＡＭＥＴＥＲ　ＳＡＡ信号に設定し、Ｓ－ＣＳＣＦ２ｃへ送信する（ステップ３０６）。 The HSS4 that has received the UNREGISTERD SERVICE request by the DIAMETER SAR recognizes that a diversion incoming call has occurred because the user is in the registration state, and information on the P-CSCF in which the user is registered, SIP The contact address information of the terminal 5 is set in the DIAMETER SAA signal and transmitted to the S-CSCF 2c (step 306).
　なお、ＨＳＳ４では、ユーザからのレジストレーション時に、本障害迂回手順を実現するために必要なＰ－ＣＳＣＦの情報、ＳＩＰ端末５のＣｏｎｔａｃｔアドレス情報をＳ－ＣＳＣＦ２ａよりＤＩＡＭＥＴＥＲ　ＳＡＡ信号にて受信し、これを記憶する必要がある。 The HSS 4 receives the P-CSCF information and the contact address information of the SIP terminal 5 from the S-CSCF 2a via the DIAMETER SAA signal when registering from the user, and necessary for realizing this failure bypass procedure. Need to remember.
　ＤＩＡＭＥＴＥＲ　ＳＡＡ信号を受信したＳ－ＣＳＣＦ２ｃは、信号情報に設定されたＰ－ＣＳＣＦの情報、ＳＩＰ端末５のＣｏｎｔａｃｔアドレス情報より再レジストレーションが必要なことを認識し、取得したＰ－ＣＳＣＦ１へ再レジストレーションを要求するＳＩＰ　ＭＥＳＳＡＧＥ（再ＲＥＧ要求）信号を送信する（ステップ３０７）。 Receiving the DIAMETER SAA signal, the S-CSCF 2c recognizes that re-registration is necessary based on the P-CSCF information set in the signal information and the contact address information of the SIP terminal 5, and re-registers with the acquired P-CSCF 1. SIP MESSAGE (re-reg request) signal for requesting transmission is transmitted (step 307).
　ＳＩＰ　ＭＥＳＳＡＧＥ信号を受信したＰ－ＣＳＣＦ１は、ＳＩＰ端末５へＳＩＰ　ＭＥＳＳＡＧＥ信号を送信する。ＳＩＰ　ＭＥＳＳＡＧＥ信号を受信したＳＩＰ端末５は、再レジストレーション要求であることを判断し、ＳＩＰ　ＭＥＳＳＡＧＥ信号の送信元のＰ－ＣＳＣＦ１へＳＩＰ　ＲＥＧＩＳＴＥＲ信号を送出する。 The P-CSCF 1 that has received the SIP MESSAGE signal transmits the SIP MESSAGE signal to the SIP terminal 5. The SIP terminal 5 that has received the SIP MESSAGE signal determines that it is a re-registration request, and sends a SIP REGISTER signal to the P-CSCF 1 that is the transmission source of the SIP MESSAGE signal.
　このＳＩＰ　ＲＥＧＩＳＴＥＲ信号を受信したＰ－ＣＳＣＦ１は、通常のレジストレーション手順を実施し、Ｓ－ＣＳＣＦ２ｃへの再レジストレーション処理を完了させる（ステップ３０８）。再レジストレーション処理が完了した後に、Ｓ－ＣＳＣＦ２ｃは、着信要求を継続するため、レジストレーション時に選択されたＡＳ３へＳＩＰ　ＩＮＶＩＴＥ信号を送信する（ステップ３０９）。 The P-CSCF 1 that has received the SIP REGISTER signal performs a normal registration procedure, and completes the re-registration process to the S-CSCF 2c (step 308). After the re-registration process is completed, the S-CSCF 2c transmits a SIP INVITE signal to the AS 3 selected at the time of registration in order to continue the incoming request (step 309).
　以上の手順によって、本実施の形態では、Ｓ－ＣＳＣＦ２ａが障害状態になった場合でも、再レジストレーション処理を実施することで、ユーザが着信サービスを継続することが可能となる。 According to the above procedure, in this embodiment, even when the S-CSCF 2a is in a failure state, the user can continue the incoming call service by performing the re-registration process.
　このようにして、本実施の形態では、加入者データを有するＩＭＳノードに相当するＳ－ＣＳＣＦが障害状態となった場合においても、ＳＩＰ　ＯＰＴＩＯＮＳによるヘルスチェックによって隣接ノードがＳ－ＣＳＣＦの障害を検出し、障害状態を認識した隣接ノードが再レジストレーション手順（ＳＩＰ　ＭＥＳＳＡＧＥ信号の送出）を実施することで、ユーザからの発着信サービスをＳ－ＣＳＣＦ障害前と同様に提供することが可能となる。よって、本実施の形態では、上述したような課題を解決することができる。 As described above, in this embodiment, even when the S-CSCF corresponding to the IMS node having the subscriber data is in a failure state, the adjacent node detects the failure of the S-CSCF by the health check by SIP OPTIONS. Then, by performing the re-registration procedure (SIP MESSAGE signal transmission) by the adjacent node that has recognized the failure state, it is possible to provide the outgoing / incoming service from the user as before the S-CSCF failure. Therefore, in this embodiment, the above-described problems can be solved.
　つまり、本実施の形態では、ＩＭＳノード間でのＳＩＰ　ＯＰＴＩＯＮＳメソッドによるヘルスチェック方式を規定することで、隣接ノードの障害状態を認識することが可能となる。これによって、隣接ノードでは、ユーザからの発信サービス要求時及びユーザへの着信要求時に発着信サービスが提供できない状態であることを認識することが可能となる。 That is, in the present embodiment, it is possible to recognize the failure state of the adjacent node by defining the health check method by the SIP OPTIONS method between the IMS nodes. As a result, the adjacent node can recognize that the outgoing / incoming service cannot be provided at the time of the outgoing call request from the user and the incoming call request to the user.
　また、本実施の形態では、ＳＩＰ　ＭＥＳＳＡＧＥメソッドによる再レジストレーション要求を規定し、発着信契機に対向ノードの障害を認識したノードがＳＩＰ　ＭＥＳＳＡＧＥメソッドによる再レジストレーション処理を実施することで、障害状態のＩＭＳノードを迂回してレジストレーション手順を実施することが可能となる。さらに、本実施の形態では、Ｓ－ＣＳＣＦが障害となった場合においても、発着信をはじめとするＩＭＳサービスの提供を継続することが可能となる。 Also, in this embodiment, a re-registration request by the SIP MESSAGE method is specified, and a node that recognizes a failure of the opposite node at the time of call origination / reception performs a re-registration process by the SIP MESSAGE method. It is possible to perform the registration procedure bypassing the IMS node. Furthermore, in the present embodiment, even when the S-CSCF becomes a failure, it is possible to continue providing IMS services such as outgoing / incoming calls.
　（第２の実施の形態）
　図７は本発明の第２の実施の形態によるＩＭＳネットワークの構成例を示すブロック図である。図７において、本発明の第２の実施の形態によるＩＭＳネットワークは、Ｐ－ＣＳＣＦ１と、Ｓ－ＣＳＣＦ２と、ＡＳ３と、ＨＳＳ４と、ＳＩＰ端末５とから構成されている。なお、Ｐ－ＣＳＣＦ１及びＳ－ＣＳＣＦ２の構成は、上述した図４に示す本発明の第１の実施の形態と同様である。 (Second Embodiment)
FIG. 7 is a block diagram showing a configuration example of an IMS network according to the second exemplary embodiment of the present invention. In FIG. 7, the IMS network according to the second embodiment of the present invention includes a P-CSCF 1, an S-CSCF 2, an AS 3, an HSS 4, and a SIP terminal 5. Note that the configurations of the P-CSCF 1 and the S-CSCF 2 are the same as those of the first embodiment of the present invention shown in FIG. 4 described above.
　ＳＩＰ端末５は、ＳＩＰプロトコルによるＧｍ－Ｉ／Ｆ（インタフェース）を介し、レジストレーション手順を実施することによって、ＩＭＳネットワークよりＶｏＩＰ（Ｖｏｉｃｅ　ｏｖｅｒ　ＩＰ）による発着信サービスをはじめとするＩＭＳサービスを享受する。 The SIP terminal 5 enjoys IMS services such as VoIP (Voice over IP) services from the IMS network by performing a registration procedure via Gm-I / F (interface) using the SIP protocol. .
　Ｐ－ＣＳＣＦ１は、ＳＩＰ端末５からのＳＩＰ　ＲＥＧＩＳＴＥＲ信号を受信すると、ＤＩＡＭＥＴＥＲプロトコルによるＣｘ－Ｉ／Ｆを介し、加入者データベースであるＨＳＳ４からＩＭＳサービスを提供するＳ－ＣＳＣＦ２の情報を取得し、ＳＩＰ　ＲＥＧＩＳＴＥＲ信号をＳ－ＣＳＣＦ２へ送信する。また、レジストレーション手順完了時には、ＳＩＰ端末５のＣｏｎｔａｃｔ　ＩＰアドレス、Ｓ－ＣＳＣＦ２のＩＰアドレス等のレジストレーション情報を保持し、以後のＩＭＳサービスにおけるＳＩＰ信号の中継制御を実施する。 Upon receiving the SIP REGISTER signal from the SIP terminal 5, the P-CSCF1 acquires information on the S-CSCF2 that provides the IMS service from the subscriber database HSS4 via the Cx-I / F using the DIAMETER protocol, and the SIP. A REGISTER signal is transmitted to the S-CSCF2. Further, when the registration procedure is completed, registration information such as the Contact IP address of the SIP terminal 5 and the IP address of the S-CSCF 2 is held, and the relay control of the SIP signal in the subsequent IMS service is performed.
　Ｓ－ＣＳＣＦ２は、Ｐ－ＣＳＣＦ１からのＳＩＰ　ＲＥＧＩＳＴＥＲ信号を受信すると、ＤＩＡＭＥＴＥＲプロトコルによるＣｘ－Ｉ／Ｆを介し、ＨＳＳ４から加入者データを取得し、これを保持することで以後の発着信サービスを加入者データにしたがって行う。 When the S-CSCF2 receives the SIP REGISTER signal from the P-CSCF1, it acquires the subscriber data from the HSS4 via the Cx-I / F using the DIAMETER protocol, and subscribes to subsequent outgoing / incoming services by holding this data. According to person data.
　また、Ｓ－ＣＳＣＦ２は、ＨＳＳ４からの加入者データに含まれるｉＦＣ（ｉｎｉｔｉａｌ　Ｆｉｌｔｅｒ　Ｃｒｉｔｅｒｉａ）情報にしたがって、ＡＳ３へＳＩＰ　ＲＥＧＩＳＴＥＲ信号を送信する。レジストレーション手順完了時に、Ｓ－ＣＳＣＦ２は、Ｐ－ＣＳＣＦ１のＩＰアドレス等のレジストレーション情報を保持することで着信サービス時のＰ－ＣＳＣＦ１のルーチングを可能とする。 In addition, the S-CSCF 2 transmits a SIP REGISTER signal to the AS 3 according to iFC (initial Filter Criteria) information included in the subscriber data from the HSS 4. When the registration procedure is completed, the S-CSCF 2 holds the registration information such as the IP address of the P-CSCF 1 to enable the routing of the P-CSCF 1 at the incoming service.
　ＡＳ３は、Ｓ－ＣＳＣＦ２からのＳＩＰ　ＲＥＧＩＳＴＥＲ信号を受信すると、ＤＩＡＭＥＴＥＲプロトコルによるＳｈ－Ｉ／Ｆを介し、ＨＳＳ４から加入者データを取得し、これを保持することで、以後の発着信サービスを加入者データにしたがって行う。 When the AS 3 receives the SIP REGISTER signal from the S-CSCF 2, it acquires the subscriber data from the HSS 4 via the Sh-I / F using the DIAMETER protocol, and holds this to hold the subsequent outgoing / incoming service to the subscriber. Follow the data.
　ＨＳＳ４は、全加入者のサービスデータを管理する加入者データベースであり、Ｓ－ＣＳＣＦ２、ＡＳ３からの要求にしたがって加入者データを送信する。また、ＨＳＳ４は、レジストレーション手順においてＰ－ＣＳＣＦ１に対して、レジストレーション制御を行うＳ－ＣＳＣＦ２を通知し、通知を行ったＳ－ＣＳＣＦ２のアドレスを保持する。 The HSS 4 is a subscriber database that manages service data of all subscribers, and transmits subscriber data in accordance with requests from the S-CSCF 2 and AS 3. Further, the HSS 4 notifies the P-CSCF 1 of the S-CSCF 2 that performs registration control in the registration procedure, and holds the address of the S-CSCF 2 that has made the notification.
　上述したように、本実施の形態は、ＳＩＰ端末５からのＳＩＰ　ＲＥＧＩＳＴＥＲ信号によって、加入者データベースであるＨＳＳ４からＳ－ＣＳＣＦ２、又はＡＳ３において発着信サービスを行うのに必要な加入者データをダウンロードし、ＳＩＰ端末５からの発着信をはじめとするサービス要求を受けると、加入者データにしたがったサービスを提供するＩＭＳネットワークに適用される。 As described above, the present embodiment downloads subscriber data necessary for performing outgoing / incoming service in the S-CSCF2 or AS3 from the subscriber database HSS4 by the SIP REGISTER signal from the SIP terminal 5. When a service request such as an incoming / outgoing call from the SIP terminal 5 is received, the service is applied to an IMS network that provides a service according to subscriber data.
　図８は本発明の第２の実施の形態によるＩＭＳレジストレーション手順を示す図である。図９は本発明の第２の実施の形態によるＳ－ＣＳＣＦ障害時の発信迂回制御手順を示す図である。図１０は本発明の第２の実施の形態によるＳ－ＣＳＣＦ障害時の着信迂回制御手順を示す図である。 FIG. 8 is a diagram showing an IMS registration procedure according to the second embodiment of the present invention. FIG. 9 is a diagram showing an outgoing call detour control procedure when the S-CSCF fails according to the second embodiment of the present invention. FIG. 10 is a diagram showing an incoming call detour control procedure when the S-CSCF fails according to the second embodiment of the present invention.
　まず、図８を参照して本発明の第２の実施の形態による「障害時の再レジストレーション手順」を行うために必要なＩＭＳレジストレーション手順について説明する。 First, the IMS registration procedure necessary for performing the “re-registration procedure at the time of failure” according to the second embodiment of the present invention will be described with reference to FIG.
　ＳＩＰ端末は、レジストレーション要求を行うために、ＳＩＰ　ＲＥＧＩＳＴＥＲ信号をＰ－ＣＳＣＦへ送信する（ステップａ１）。ＳＩＰ　ＲＥＧＩＳＴＥＲ信号を受信したＰ－ＣＳＣＦは、ＳＩＰ　ＲＥＧＩＳＴＥＲ信号を送信するＳ－ＣＳＣＦを選択するために、ＨＳＳへＤＩＡＭＥＴＥＲ　ＵＡＲ／ＵＡＡ手順を実施する（ステップａ２）。これによって、Ｐ－ＣＳＣＦは、Ｓ－ＣＳＣＦを選択し、選択したＳ－ＣＳＣＦにＳＩＰ　ＲＥＧＩＳＴＥＲ信号を送信する（ステップａ３）。 The SIP terminal transmits a SIP REGISTER signal to the P-CSCF in order to make a registration request (step a1). The P-CSCF that has received the SIP REGISTER signal performs the DIAMETER UAR / UAA procedure to the HSS in order to select the S-CSCF that transmits the SIP REGISTER signal (step a2). As a result, the P-CSCF selects the S-CSCF, and transmits a SIP REGISTER signal to the selected S-CSCF (step a3).
　Ｓ－ＣＳＣＦは、受信したＳＩＰ　ＲＥＧＩＳＴＥＲ信号内のＣｏｎｔａｃｔヘッダ、ＲｏｕｔｅヘッダからＳＩＰ端末のＩＰアドレス及びＰ－ＣＳＣＦのＩＰアドレスを取得し、これらの情報をＤＩＡＭＥＴＥＲ　ＳＡＲ信号へ設定し、ＨＳＳへ送信する（ステップａ４）。 The S-CSCF acquires the IP address of the SIP terminal and the IP address of the P-CSCF from the Contact header and the Route header in the received SIP REGISTER signal, sets these information in the DIAMETER SAR signal, and transmits it to the HSS ( Step a4).
　ＤＩＡＭＥＴＥＲ　ＳＡＲ信号を受信したＨＳＳは、設定されたＳＩＰ端末のＩＰアドレス及びＰ－ＣＳＣＦのＩＰアドレスを記憶し、加入者のサービスプロファイルをＤＩＡＭＥＴＥＲ　ＳＡＡ信号でＳ－ＣＳＣＦへ送信する（ステップａ５）。 The HSS that has received the DIAMETER SAR signal stores the set IP address of the SIP terminal and the IP address of the P-CSCF, and transmits the subscriber's service profile to the S-CSCF using the DIAMETER SAA signal (step a5).
　ＤＩＡＭＥＴＥＲ　ＳＡＡ信号を受信したＳ－ＣＳＣＦは、レジストレーション手順完了を示すＳＩＰ　２００　ＯＫをＰ－ＣＳＣＦへ送信する（ステップａ６）。ＳＩＰ　２００　ＯＫを受信したＰ－ＣＳＣＦはレジストレーション手順完了を示すＳＩＰ　２００　ＯＫをＳＩＰ端末へ送信する（ステップａ７）。 The S-CSCF that has received the DIAMETER SAA signal transmits SIP 200 OK indicating the completion of the registration procedure to the P-CSCF (step a6). The P-CSCF that has received the SIP 200 OK transmits a SIP 200 OK indicating completion of the registration procedure to the SIP terminal (step a7).
　Ｓ－ＣＳＣＦは、ＡＳへのレジストレーションを行うために、ＳＩＰ　ＲＥＧＩＳＴＥＲ信号を送信する（ステップａ８）。ＡＳは、加入者のサービスプロファイルを取得するために、ＨＳＳへＤＩＡＭＥＴＥＲ　ＵＤＲ／ＵＤＡ手順を実施し（ステップａ９）、レジストレーション手順完了を示すＳＩＰ　２００　ＯＫをＳ－ＣＳＣＦへ送信する（ステップａ１０）。 The S-CSCF transmits a SIP REGISTER signal to perform registration with the AS (step a8). The AS performs the DIAMETER UDR / UDA procedure to the HSS in order to acquire the subscriber's service profile (step a9), and transmits SIP 200 OK indicating completion of the registration procedure to the S-CSCF (step a10).
　次に、図９を参照して本発明の第２の実施の形態によるＳ－ＣＳＣＦ障害時の発信迂回制御手順について説明する。ここでは、Ｓ－ＣＳＣＦ２ａが何らかの要因によってノード障害になったものとする（ステップｂ１）。 Next, with reference to FIG. 9, a description will be given of a call detour control procedure when an S-CSCF failure occurs according to the second embodiment of the present invention. Here, it is assumed that the S-CSCF 2a has a node failure due to some factor (step b1).
　Ｐ－ＣＳＣＦは、周期的に実施しているヘルスチェック手順を起動し、ＳＩＰ　ＯＰＴＩＯＮＳ信号をＳ－ＣＳＣＦ２ａに送信する（ステップｂ２）。Ｓ－ＣＳＣＦ２ａは、障害状態であるので、ＳＩＰ　ＯＰＴＩＯＮＳ信号を受信することができないため、Ｐ－ＣＳＣＦは送信したヘルスチェックのＳＩＰ　ＯＰＴＩＯＮＳ信号の応答待ちタイムアウトを検出し、Ｓ－ＣＳＣＦ２ａが障害状態であることを認識する（ステップｂ３）。 The P-CSCF starts a health check procedure that is periodically performed, and transmits a SIP OPTIONS signal to the S-CSCF 2a (step b2). Since the S-CSCF2a cannot receive the SIP OPTIONS signal because it is in a failure state, the P-CSCF detects a response waiting timeout for the SIP OPTIONS signal of the transmitted health check, and the S-CSCF2a is in the failure state This is recognized (step b3).
　この後に、ＳＩＰ端末は、発信要求を行うために、ＳＩＰ　ＩＮＶＩＴＥ信号をＰ－ＣＳＣＦへ送信する（ステップｂ４）。ＳＩＰ　ＩＮＶＩＴＥ信号を受信したＰ－ＣＳＣＦは、発信処理を行うために、Ｓ－ＣＳＣＦ２ａへＳＩＰ　ＩＮＶＩＴＥ信号を送信しようとするが、Ｓ－ＣＳＣＦ２ａが障害状態であるため、再レジストレーション手順が必要と判断する（ステップｂ５）。 After this, the SIP terminal transmits a SIP INVITE signal to the P-CSCF in order to make a call request (step b4). The P-CSCF that has received the SIP INVITE signal tries to send the SIP INVITE signal to the S-CSCF 2a in order to perform outgoing call processing. However, since the S-CSCF 2a is in a failure state, it is determined that a re-registration procedure is necessary. (Step b5).
　Ｐ－ＣＳＣＦは、再レジストレーションを行うために、ＳＩＰ端末へＳＩＰ　ＭＥＳＳＡＧＥ信号へ拡張ヘッダ「Ｘ－ＳｅｒｖｉｃｅＴｙｐｅ：ｒｅｇｉｓｔｒａｔｉｏｎ＿ｒｅｑｕｅｓｔ」を設定して送信する（ステップｂ６）。ＳＩＰ　ＭＥＳＳＡＧＥ信号を受信したＳＩＰ端末は、再レジストレーションが必要なことを認識し、Ｐ－ＣＳＣＦへＳＩＰ　ＲＥＧＩＳＴＥＲ信号を送信する（ステップｂ７）。なお、Ｓ－ＣＳＣＦ２ａが障害であるため、別のＳ－ＣＳＣＦ２ｂへのレジストレーション手順が実施される（ステップｂ８）。 The P-CSCF sets the extension header “X-ServiceType: registration_request” to the SIP MESSAGE signal and transmits it to the SIP terminal for re-registration (step b6). The SIP terminal that has received the SIP MESSAGE signal recognizes that re-registration is necessary, and transmits a SIP REGISTER signal to the P-CSCF (step b7). Since the S-CSCF 2a is faulty, a registration procedure for another S-CSCF 2b is performed (step b8).
　レジストレーション手順が完了すると、Ｐ－ＣＳＣＦは、ＳＩＰ　２００　ＯＫ信号をＳＩＰ端末へ送信する（ステップｂ９）。ＳＩＰ　２００　ＯＫ信号を受信したＳＩＰ端末は、レジストレーションが完了したため、ＳＩＰ　ＭＥＳＳＡＧＥ信号に対する応答信号（ＳＩＰ　２００　ＯＫ信号）をＰ－ＣＳＣＦへ送信する（ステップｂ１０）。 When the registration procedure is completed, the P-CSCF transmits a SIP 200 OK signal to the SIP terminal (step b9). The SIP terminal that has received the SIP 200 OK signal transmits a response signal (SIP 200 OK signal) to the SIP MESSAGE signal to the P-CSCF because the registration is completed (step b10).
　ＳＩＰ　２００　ＯＫ信号を受信したＰ－ＣＳＣＦは、ＳＩＰ端末からの再レジストレーション処理が成功したことを認識し、ＳＩＰ端末からの発信要求処理を継続し（ステップｂ１１）、Ｓ－ＣＳＣＦ２ｂへＳＩＰ　ＩＮＶＩＴＥ信号を送信する（ステップｂ１２）。 Receiving the SIP 200 OK signal, the P-CSCF recognizes that the re-registration process from the SIP terminal has succeeded, continues the call request process from the SIP terminal (step b11), and sends the SIP INVITE signal to the S-CSCF 2b. Is transmitted (step b12).
　さらに、図１０を参照して本発明の第２の実施の形態によるＳ－ＣＳＣＦ障害時の着信迂回制御手順について説明する。ここでは、Ｓ－ＣＳＣＦ２ａが何らかの要因によってノード障害になったものとする（ステップｃ１）。 Furthermore, with reference to FIG. 10, a description will be given of an incoming call detour control procedure when an S-CSCF failure occurs according to the second embodiment of the present invention. Here, it is assumed that the S-CSCF 2a has a node failure due to some factor (step c1).
　Ｓ－ＣＳＣＦ２ｃは、周期的に実施しているヘルスチェック手順を起動し、ＳＩＰ　ＯＰＴＩＯＮＳ信号をＳ－ＣＳＣＦ２ａに送信する（ステップｃ２）。Ｓ－ＣＳＣＦ２ａは、障害状態であるので、ＳＩＰ　ＯＰＴＩＯＮＳ信号を受信することができないため、Ｓ－ＣＳＣＦ２ｃは、送信したヘルスチェックのＳＩＰ　ＯＰＴＩＯＮＳ信号の応答待ちタイムアウトを検出し、Ｓ－ＣＳＣＦ２ａが障害状態であることを認識する（ステップｃ３）。 The S-CSCF 2c starts a health check procedure that is periodically performed, and transmits a SIP OPTIONS signal to the S-CSCF 2a (step c2). Since S-CSCF2a is in a failure state and cannot receive the SIP OPTIONS signal, S-CSCF2c detects a response wait timeout for the SIP OPTIONS signal of the transmitted health check, and S-CSCF2a is in the failure state. Recognize that it exists (step c3).
　Ｓ－ＣＳＣＦ２ｃは、ＳＩＰ端末に対する発信要求をＳＩＰ　ＩＮＶＩＴＥ信号によって受信すると（ステップｃ４）、ＳＩＰ　ＩＮＶＩＴＥ信号の送信先を取得するためにＨＳＳへＤＩＡＭＥＴＥＲ　ＬＩＲ／ＬＩＡ手順を実施し（ステップｃ５）、送信先がＳ－ＣＳＣＦ２ａであることを認識する。 When the S-CSCF 2c receives a call request to the SIP terminal by the SIP INVITE signal (step c4), the S-CSCF 2c performs the DIAMETER LIR / LIA procedure to the HSS to acquire the destination of the SIP INVITE signal (step c5). Is S-CSCF2a.
　Ｓ－ＣＳＣＦ２ｃは、ＳＩＰ　ＩＮＶＩＴＥ信号の送信先であるＳ－ＣＳＣＦ２ａが障害状態であると判断すると、Ｓ－ＣＳＣＦ２ｂを選択してＳＩＰ　ＩＮＶＩＴＥ信号を送信する（ステップｃ６，ｃ７）。 If the S-CSCF 2c determines that the S-CSCF 2a that is the transmission destination of the SIP INVITE signal is in a failure state, the S-CSCF 2c selects the S-CSCF 2b and transmits the SIP INVITE signal (steps c6 and c7).
　ＳＩＰ　ＩＮＶＩＴＥ信号を受信したＳ－ＣＳＣＦ２ｂは、着信要求を受けた加入者データを保持していないため、ＵＮＲＥＧＩＳＴＥＲＥＤ　ＳＥＲＶＩＣＥ手順を実施し（ステップｃ８）、ＤＩＡＭＥＴＥＲ　ＳＡＲ（ＵＮＲＥＧＩＳＴＥＲＥＤ　ＳＥＲＶＩＣＥ）信号をＨＳＳへ送信する（ステップｃ９）。 The S-CSCF 2b that has received the SIP INVITE signal does not hold the subscriber data that has received the incoming call request. Therefore, the UNREGISTERED SERVICE procedure is performed (step c8), and the DIAMETER SAR (UNREGISTERED SERVICE) signal is transmitted to the HSS ( Step c9).
　ＤＩＡＭＥＴＥＲ　ＳＡＲ信号を受信したＨＳＳは、ユーザがレジストレーション状態であることから障害時の迂回手順が発生していることを認識し、ＤＩＡＭＥＴＥＲ　ＳＡＡ信号へ、レジストレーション時に記憶したＳＩＰ端末及びＰ－ＣＳＣＦのＩＰアドレス情報を設定し、このＤＩＡＭＥＴＥＲ　ＳＡＡ信号をＳ－ＣＳＣＦ２ｂに送信する（ステップｃ１０）。 The HSS that has received the DIAMETER SAR signal recognizes that a detour procedure at the time of failure has occurred because the user is in the registration state, and stores the SIP terminal and P-CSCF stored in the DIAMETER SAA signal at the time of registration. IP address information is set, and this DIAMETER SAA signal is transmitted to the S-CSCF 2b (step c10).
　ＤＩＡＭＥＴＥＲ　ＳＡＡ信号を受信したＳ－ＣＳＣＦ２ｂは、受信した信号にＳＩＰ端末及びＰ－ＣＳＣＦのＩＰアドレス情報が設定されていることから、障害による着信迂回処理が発生していることを認識し、ＳＩＰ　ＭＥＳＳＡＧＥ信号へ、拡張ヘッダ「Ｘ－ＳｅｒｖｉｃｅＴｙｐｅ：ｒｅｇｉｓｔｒａｔｉｏｎ＿ｒｅｑｕｅｓｔ」を設定し、そのＳＩＰ　ＭＥＳＳＡＧＥ信号をＰ－ＣＳＣＦに送信する（ステップｃ１１）。また、Ｐ－ＣＳＣＦは、受信したＳＩＰ　ＭＥＳＳＡＧＥ信号をＳＩＰ端末に送信する（ステップｃ１２）。 The S-CSCF 2b that has received the DIAMETER SAA signal recognizes that the incoming call detour processing due to the failure has occurred since the IP address information of the SIP terminal and the P-CSCF is set in the received signal, and the SIP MESSAGE. An extension header “X-ServiceType: registration_request” is set in the signal, and the SIP MESSAGE signal is transmitted to the P-CSCF (step c11). Further, the P-CSCF transmits the received SIP MESSAGE signal to the SIP terminal (step c12).
　ＳＩＰ　ＭＥＳＳＡＧＥ信号を受信したＳＩＰ端末は、再レジストレーションが必要なことを認識し、Ｐ－ＣＳＣＦにＳＩＰ　ＲＥＧＩＳＴＥＲ信号を送信する（ステップｃ１３）。なお、Ｐ－ＣＳＣＦでは、Ｓ－ＣＳＣＦ２ａが障害であるため、別のＳ－ＣＳＣＦ２ｂへのレジストレーション手順が実施される（ステップｃ１４）。 The SIP terminal that has received the SIP MESSAGE signal recognizes that re-registration is necessary, and transmits a SIP REGISTER signal to the P-CSCF (step c13). In the P-CSCF, since the S-CSCF 2a is faulty, a registration procedure to another S-CSCF 2b is performed (step c14).
　レジストレーション手順が完了すると、Ｐ－ＣＳＣＦは、ＳＩＰ　２００　ＯＫ信号をＳＩＰ端末へ送信する（ステップｃ１５）。ＳＩＰ　２００　ＯＫ信号を受信したＳＩＰ端末は、レジストレーションが完了したため、ＳＩＰ　ＭＥＳＳＡＧＥ信号に対する応答信号（ＳＩＰ　２００　ＯＫ信号）をＰ－ＣＳＣＦに送信する（ステップｃ１６）。 When the registration procedure is completed, the P-CSCF transmits a SIP 200 OK signal to the SIP terminal (step c15). The SIP terminal that has received the SIP 200 OK signal transmits a response signal (SIP 200 OK signal) to the SIP MESSAGE signal to the P-CSCF because registration is completed (step c16).
　ＳＩＰ　ＭＥＳＳＡＧＥ信号に対する応答信号を受信したＰ－ＣＳＣＦは、Ｓ－ＣＳＣＦ２ｂにＳＩＰ　２００　ＯＫ信号を送信する（ステップｃ１７）。ＳＩＰ　２００　ＯＫ信号を受信したＳ－ＣＳＣＦ２ｂは、ＳＩＰ端末からの再レジストレーション処理が成功したことを認識し、Ｓ－ＣＳＣＦ２ｃから受信した着信ＩＮＶＩＴＥ要求を継続する（ステップｃ１８）。 The P-CSCF that has received the response signal to the SIP MESSAGE signal transmits a SIP 200 OK signal to the S-CSCF 2b (step c17). Receiving the SIP 200 OK signal, the S-CSCF 2b recognizes that the re-registration process from the SIP terminal has succeeded, and continues the incoming INVITE request received from the S-CSCF 2c (step c18).
　このように、本実施の形態では、ＩＭＳネットワークにおけるノードが隣接ノードと周期的にＳＩＰ　ＯＰＴＩＯＮＳメソッドによるヘルスチェック方式を実施することで、隣接ノードのノード障害を認識することが可能となる。これによって、本実施の形態では、発着信サービスを実施するユーザがレジストレーションされているノードが障害となっている場合、障害を判断したノードが再レジストレーション手順を行うことができる。 Thus, in this embodiment, a node in an IMS network can recognize a node failure of an adjacent node by periodically performing a health check method using the SIP OPTIONS method with the adjacent node. As a result, in this embodiment, when the node to which the user who performs the outgoing / incoming service is registered has a failure, the node that has determined the failure can perform the re-registration procedure.
　また、本実施の形態では、ユーザからのレジストレーション時に割り付けられたＳ－ＣＳＣＦが障害となった場合においても、ユーザが発着信のＩＭＳサービスを継続して享受することが可能となる。 Further, in this embodiment, even when the S-CSCF assigned at the time of registration from the user becomes a failure, the user can continue to enjoy outgoing and incoming IMS services.
　（第３の実施の形態）
　図１１は本発明の第３の実施の形態によるＡＳ障害時の発信迂回手順を示す図であり、図１２は本発明の第３の実施の形態によるＡＳ障害時の着信迂回手順を示す図である。本発明の第３の実施の形態は、その基本的な構成が図７に示す本発明の第２の実施の形態によるＩＭＳネットワークと同様の構成となっている。但し、本発明の第３の実施の形態では、ＩＭＳネットワークにおいて加入者データを取得し、各種サービスを提供するアプリケーションサーバ（ＡＳ）の障害時に本発明を適用したものである。 (Third embodiment)
FIG. 11 is a diagram showing an outgoing call bypass procedure at the time of AS failure according to the third embodiment of the present invention, and FIG. 12 is a diagram showing an incoming call bypass procedure at the time of AS failure according to the third embodiment of the present invention. is there. The basic configuration of the third embodiment of the present invention is the same as that of the IMS network according to the second embodiment of the present invention shown in FIG. However, in the third embodiment of the present invention, the present invention is applied when an application server (AS) that obtains subscriber data and provides various services in an IMS network fails.
　図１１を参照して本発明の第３の実施の形態によるＡＳ障害時の発信迂回手順について説明する。ここでは、ＡＳ３ａが何らかの要因によってノード障害になったものとする（ステップｄ１）。 Referring to FIG. 11, a description will be given of a call detour procedure at the time of an AS failure according to the third embodiment of the present invention. Here, it is assumed that the AS 3a has a node failure due to some factor (step d1).
　Ｓ－ＣＳＣＦは、周期的に実施しているヘルスチェック手順を起動し、ＳＩＰ　ＯＰＴＩＯＮＳ信号をＡＳ３ａに送信する（ステップｄ２）。ＡＳ３ａは、障害状態であるので、ＳＩＰ　ＯＰＴＩＯＮＳ信号を受信することができないため、Ｓ－ＣＳＣＦは、送信したヘルスチェックのＳＩＰ　ＯＰＴＩＯＮＳ信号の応答待ちタイムアウトを検出し、ＡＳ３ａが障害状態であることを認識する（ステップｄ３）。 The S-CSCF starts a health check procedure that is periodically executed, and transmits a SIP OPTIONS signal to the AS 3a (step d2). Since the AS 3a cannot receive the SIP OPTIONS signal because it is in a fault state, the S-CSCF detects a timeout waiting for the response of the SIP OPTIONS signal of the transmitted health check and recognizes that the AS 3a is in the fault state (Step d3).
　ＳＩＰ端末は、発信要求を行うために、ＳＩＰ　ＩＮＶＩＴＥ信号をＰ－ＣＳＣＦに送信し（ステップｄ４）、ＳＩＰ　ＩＮＶＩＴＥ信号を受信したＰ－ＣＳＣＦは、Ｓ－ＣＳＣＦへＳＩＰ　ＩＮＶＩＴＥ信号を送信する（ステップｄ５）。 The SIP terminal transmits a SIP INVITE signal to the P-CSCF in order to make a call request (step d4), and the P-CSCF that has received the SIP INVITE signal transmits a SIP INVITE signal to the S-CSCF (step d5). ).
　ＳＩＰ　ＩＮＶＩＴＥ信号を受信したＳ－ＣＳＣＦは、発信処理を行うために、ＡＳ３ａへＳＩＰ　ＩＮＶＩＴＥ信号を送信しようとするが、ＡＳ３ａが障害状態であるので、再レジストレーション手順が必要と判断する（ステップｄ６）。再レジストレーションを行うために、Ｓ－ＣＳＣＦは、ＡＳ３ｂを選択してＳＩＰ　ＲＥＧＩＳＴＥＲ信号を送信する（ステップｄ７）。 The S-CSCF that has received the SIP INVITE signal tries to transmit the SIP INVITE signal to the AS 3a in order to perform outgoing call processing, but determines that a re-registration procedure is necessary because the AS 3a is in a failure state (step d6). ). In order to perform re-registration, the S-CSCF selects the AS 3b and transmits a SIP REGISTER signal (step d7).
　ＳＩＰ　ＲＥＧＩＳＴＥＲ信号を受信したＡＳ３ｂは、ＨＳＳとの間でレジストレーション手順を実施し（ステップｄ８）、加入者データを取得し、Ｓ－ＣＳＣＦにＳＩＰ　２００　ＯＫ信号を送信する（ステップｄ９）。ＳＩＰ　２００　ＯＫ信号を受信したＳ－ＣＳＣＦは、ＡＳ３ｂへの再レジストレーション処理が成功したことを認識し、ＳＩＰ端末からの発信要求処理を継続し（ステップｄ１０）、再レジストレーションを行ったＡＳ３ｂに対してＳＩＰ　ＩＮＶＩＴＥ信号を送信する（ステップｄ１１）。 The AS 3b that has received the SIP REGISTER signal performs a registration procedure with the HSS (step d8), acquires subscriber data, and transmits a SIP 200 OK signal to the S-CSCF (step d9). The S-CSCF that has received the SIP 200 OK signal recognizes that the re-registration process to the AS 3b has been successful, continues the call request process from the SIP terminal (step d10), and sends the re-registration to the AS 3b that has performed the re-registration. In response, a SIP INVITE signal is transmitted (step d11).
　次に、図１２を参照して本発明の第３の実施の形態によるＡＳ障害時の着信迂回手順について説明する。ここでは、ＡＳ３ａが何らかの要因によってノード障害になったものとする（ステップｅ１）。 Next, with reference to FIG. 12, an incoming call detouring procedure at the time of AS failure according to the third embodiment of the present invention will be described. Here, it is assumed that the AS 3a has a node failure due to some factor (step e1).
　Ｓ－ＣＳＣＦは、周期的に実施しているヘルスチェック手順を起動し、ＳＩＰ　ＯＰＴＩＯＮＳ信号をＡＳ３ａに送信する（ステップｅ２）。ＡＳ３ａは、障害状態であるので、ＳＩＰ　ＯＰＴＩＯＮＳ信号を受信することができないため、Ｓ－ＣＳＣＦは、送信したヘルスチェックのＳＩＰ　ＯＰＴＩＯＮＳ信号の応答待ちタイムアウトを検出し、ＡＳ３ａが障害状態であることを認識する（ステップｅ３）。 The S-CSCF starts a health check procedure that is periodically performed, and transmits a SIP OPTIONS signal to the AS 3a (step e2). Since the AS 3a cannot receive the SIP OPTIONS signal because it is in a fault state, the S-CSCF detects a timeout waiting for the response of the SIP OPTIONS signal of the transmitted health check and recognizes that the AS 3a is in the fault state (Step e3).
　Ｓ－ＣＳＣＦは、着信要求のＳＩＰ　ＩＮＶＩＴＥ信号を受信すると（ステップｅ４）、着信要求を行うために、ＳＩＰ　ＩＮＶＩＴＥ信号をＡＳ３ａに送信しようとするが、ＡＳ３ａが障害状態であるので、再レジストレーション手順が必要と判断する（ステップｅ５）。 When the S-CSCF receives the SIP INVITE signal of the incoming request (step e4), it tries to send the SIP INVITE signal to the AS 3a to perform the incoming request. However, since the AS 3a is in a failure state, the re-registration procedure Is determined to be necessary (step e5).
　Ｓ－ＣＳＣＦは、再レジストレーションを行うため、ＡＳ３ｂを選択してＳＩＰ　ＲＥＧＩＳＴＥＲ信号を送信する（ステップｅ６）。ＳＩＰ　ＲＥＧＩＳＴＥＲ信号を受信したＡＳ３ｂは、ＨＳＳとの間でレジストレーション手順を実施し（ステップｅ７）、加入者データを取得し、Ｓ－ＣＳＣＦにＳＩＰ　２００　ＯＫ信号を送信する（ステップｅ８）。 The S-CSCF selects the AS 3b and transmits a SIP REGISTER signal for re-registration (step e6). The AS 3b that has received the SIP REGISTER signal performs a registration procedure with the HSS (step e7), acquires subscriber data, and transmits a SIP 200 OK signal to the S-CSCF (step e8).
　ＳＩＰ　２００　ＯＫ信号を受信したＳ－ＣＳＣＦは、ＡＳ３ｂへの再レジストレーション処理が成功したことを認識し、着信要求処理を継続し（ステップｅ９）、再レジストレーションを行ったＡＳ３ｂに対してＳＩＰ　ＩＮＶＩＴＥ信号を送信する（ステップｅ１０）。 The S-CSCF that has received the SIP 200 OK signal recognizes that the re-registration process to the AS 3b has succeeded, continues the incoming request process (step e9), and performs the SIP INVITE to the AS 3b that has performed the re-registration. A signal is transmitted (step e10).
　このように、本実施の形態では、ＩＭＳネットワークにおけるノードが隣接ノードと周期的にＳＩＰ　ＯＰＴＩＯＮＳメソッドによるヘルスチェック方式を実施することで、隣接ノードのノード障害を認識することが可能となる。これによって、本実施の形態では、発着信サービスを実施するユーザがレジストレーションされているノードが障害となっている場合、障害を判断したノードが再レジストレーション手順を行うことができる。 Thus, in this embodiment, a node in an IMS network can recognize a node failure of an adjacent node by periodically performing a health check method using the SIP OPTIONS method with the adjacent node. As a result, in this embodiment, when the node to which the user who performs the outgoing / incoming service is registered has a failure, the node that has determined the failure can perform the re-registration procedure.
　また、本実施の形態では、ユーザからのレジストレーション時に割り付けられたＡＳが障害となった場合においても、ユーザが発着信のＩＭＳサービスを継続して享受することが可能となる。 Also, in this embodiment, even when the AS assigned during registration from the user becomes a failure, the user can continue to receive the incoming and outgoing IMS services.
　本発明の効果の一例として、隣接ノードのノード障害を認識することができ、ユーザが発着信のＩＭＳサービスを継続して享受することができる。 As an example of the effect of the present invention, a node failure of an adjacent node can be recognized, and the user can continuously enjoy outgoing and incoming IMS services.
　以上、実施形態および実施例を参照して本願発明を説明したが、本願発明は上記実施形態および実施例に限定されるものではない。本願発明の構成や詳細には、本願発明のスコープ内で当業者が理解し得る様々な変更をすることができる。 Although the present invention has been described with reference to the embodiments and examples, the present invention is not limited to the above embodiments and examples. Various changes that can be understood by those skilled in the art can be made to the configuration and details of the present invention within the scope of the present invention.
　この出願は、２００８年１月３０日に出願された日本出願の特願２００８－０１８４４９の内容が全て取り込まれており、この日本出願を基礎として優先権を主張するものである。 This application incorporates all the contents of Japanese Patent Application No. 2008-018449 filed on January 30, 2008, and claims priority based on this Japanese application.

Claims (17)

  1. 　音声を含むマルチメディア通信の制御にＳＩＰを利用してマルチメディアサービスをユーザに提供するＩＰマルチメディアサブシステムのノード装置であって、
    　隣接するノード装置に対してヘルスチェックを実施するヘルスチェック部と、
    　前記ヘルスチェック部によるヘルスチェックの結果に基づいて前記隣接するノード装置の障害状態を認識する認識部と、
    を有するノード装置。     A node device of an IP multimedia subsystem for providing a multimedia service to a user using SIP for controlling multimedia communication including voice,
    A health check unit that performs health checks on adjacent node devices;
    A recognition unit for recognizing a failure state of the adjacent node device based on a result of a health check by the health check unit;
    A node device.
  2. 　前記ヘルスチェック部は、ＳＩＰ　ＯＰＴＩＯＮＳメソッドによるヘルスチェックを実施する、請求の範囲第１項に記載のノード装置。 The node device according to claim 1, wherein the health check unit performs a health check by a SIP OPTIONS method.
  3. 　前記認識部は、前記隣接するノード装置において、ユーザからの発信サービス要求時及びユーザへの着信要求時に発着信サービスが提供できない状態であることを認識する、請求の範囲第１項又は第２項に記載のノード装置。 The said recognition part recognizes that it is in the state which cannot provide an outgoing / incoming service in the said adjacent node apparatus at the time of the outgoing service request from a user, and the incoming request to a user. The node device described in 1.
  4. 　前記認識部が前記隣接するノード装置の障害状態を検出したとき、再レジストレーションによる迂回制御を行う再レジストレーション手順実施部をさらに有する、請求の範囲第１項から第３項のいずれか１項に記載のノード装置。 4. The method according to claim 1, further comprising: a re-registration procedure execution unit that performs detour control by re-registration when the recognition unit detects a failure state of the adjacent node device. 5. The node device described in 1.
  5. 　前記再レジストレーション手順実施部は、ＳＩＰ　ＭＥＳＳＡＧＥメソッドによる再レジストレーション手順を実施する、請求の範囲第４項に記載のノード装置。 The node device according to claim 4, wherein the re-registration procedure execution unit performs a re-registration procedure by a SIP MESSAGE method.
  6. 　サービング呼セッション制御装置及びプロキシー呼セッション制御装置のうちいずれかであり、隣接するサービング呼セッション制御装置、及びアプリケーションサーバの障害状態を検出する、請求の範囲第１項から第５項のいずれか１項に記載のノード装置。 Any one of the serving call session control device and the proxy call session control device, and detects a failure state of an adjacent serving call session control device and an application server. The node device according to item.
  7. 　前記サービング呼セッション制御装置がＰ－ＣＳＣＦであり、
    　前記プロキシー呼セッション制御装置がＳ－ＣＳＣＦである、請求の範囲第６項に記載のノード装置。     The serving call session control device is a P-CSCF;
    The node device according to claim 6, wherein the proxy call session control device is an S-CSCF.
  8. 　請求の範囲第１項から第７項のいずれか１項に記載のノード装置を複数有する通信システム。 A communication system having a plurality of node devices according to any one of claims 1 to 7.
  9. 　複数の前記ノード装置として第１のノード装置と該第１のノード装置に隣接する第２のノード装置とが設けられ、
    　前記第１のノード装置および前記第２のノード装置は互いに相手のヘルスチェックを行う、請求の範囲第８項に記載の通信システム。     A first node device and a second node device adjacent to the first node device as the plurality of node devices;
    The communication system according to claim 8, wherein the first node device and the second node device perform a health check on each other.
  10. 　複数の前記ノード装置として第１のノード装置と該第１のノード装置に隣接する第２のノード装置とが設けられ、
    　前記第１のノード装置は、前記第２のノード装置の障害状態を検出すると、着信の迂回制御を行う、請求の範囲第８項又は第９項に記載の通信システム。     A first node device and a second node device adjacent to the first node device as the plurality of node devices;
    10. The communication system according to claim 8, wherein the first node device performs incoming call detour control when detecting a failure state of the second node device. 11.
  11. 　音声を含むマルチメディア通信の制御にＳＩＰを利用してマルチメディアサービスをユーザに提供するＩＰマルチメディアサブシステムのノード装置によるサービス提供方法であって、
    　隣接するノード装置に対してヘルスチェックを実施するヘルスチェック処理と、
    　前記ヘルスチェック処理によるヘルスチェックの結果に基づいて前記隣接するノード装置の障害状態を認識する認識処理と、を行うサービス提供方法。     A service providing method by a node device of an IP multimedia subsystem for providing a multimedia service to a user using SIP for controlling multimedia communication including voice,
    A health check process for performing a health check on an adjacent node device;
    A service providing method for performing recognition processing for recognizing a failure state of the adjacent node device based on a result of health check by the health check processing.
  12. 　前記ヘルスチェック処理は、ＳＩＰ　ＯＰＴＩＯＮＳメソッドによるヘルスチェックを実施するものである、請求の範囲第１１項に記載のサービス提供方法。 12. The service providing method according to claim 11, wherein the health check process is to perform a health check by a SIP OPTIONS method.
  13. 　前記認識処理は、前記隣接するノード装置において、ユーザからの発信サービス要求時及びユーザへの着信要求時に発着信サービスが提供できない状態であることを認識するものである、請求の範囲第１１項又は第１２項に記載のサービス提供方法。 The recognition process according to claim 11, wherein the recognition processing recognizes that the adjacent node device is in a state in which an outgoing / incoming service cannot be provided when an outgoing service is requested from a user and when an incoming request is made to the user. 13. The service providing method according to item 12.
  14. 　前記認識処理で前記隣接するノード装置の障害状態を検出したとき、再レジストレーションによる迂回制御を行う再レジストレーション手順実施処理をさらに有する、請求の範囲第１１項から第１３項のいずれか１項に記載のサービス提供方法。 The reregistration procedure execution processing for performing detour control by reregistration when a failure state of the adjacent node device is detected by the recognition processing, according to any one of claims 11 to 13. The service providing method described in 1.
  15. 　前記再レジストレーション手順実施処理は、ＳＩＰ　ＭＥＳＳＡＧＥメソッドによる再レジストレーション手順を実施するものである、請求の範囲第１４項に記載のサービス提供方法。 15. The service providing method according to claim 14, wherein the re-registration procedure execution processing is to execute a re-registration procedure by a SIP MESSAGE method.
  16. 　前記ノード装置は、サービング呼セッション制御装置及びプロキシー呼セッション制御装置のうちいずれかであり、隣接するサービング呼セッション制御装置、及びアプリケーションサーバの障害状態を検出する、請求の範囲第１１項から第１５項のいずれか１項に記載のサービス提供方法。 16. The node device according to claim 11, wherein the node device is one of a serving call session control device and a proxy call session control device, and detects a failure state of an adjacent serving call session control device and an application server. The service provision method according to any one of the items.
  17. 　前記サービング呼セッション制御装置がＰ－ＣＳＣＦであり、
    　前記プロキシー呼セッション制御装置がＳ－ＣＳＣＦである、請求の範囲第１６項に記載のサービス提供方法。     The serving call session control device is a P-CSCF;
    The service providing method according to claim 16, wherein the proxy call session control device is an S-CSCF.
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